1098442665 has 12 divisors (see below), whose sum is σ = 1903967364. Its totient is φ = 585836064.

The previous prime is 1098442663. The next prime is 1098442693. The reversal of 1098442665 is 5662448901.

It can be written as a sum of positive squares in 2 ways, for example, as 228251664 + 870191001 = 15108^2 + 29499^2 .

It is not a de Polignac number, because 1098442665 - 2¹ = 1098442663 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 24409837 = 1098442665 / (1 + 0 + 9 + 8 + 4 + 4 + 2 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1098442665.

It is not an unprimeable number, because it can be changed into a prime (1098442663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12204874 + ... + 12204963.

It is an arithmetic number, because the mean of its divisors is an integer number (158663947).

Almost surely, 2^1098442665 is an apocalyptic number.

1098442665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1098442665 is a deficient number, since it is larger than the sum of its proper divisors (805524699).

1098442665 is a wasteful number, since it uses less digits than its factorization.

1098442665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24409848 (or 24409845 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 1098442665 is about 33142.7618794813. The cubic root of 1098442665 is about 1031.7927320589.

The spelling of 1098442665 in words is "one billion, ninety-eight million, four hundred forty-two thousand, six hundred sixty-five".