1098868865 has 16 divisors (see below), whose sum is σ = 1410614352. Its totient is φ = 818847744.

The previous prime is 1098868801. The next prime is 1098868871. The reversal of 1098868865 is 5688688901.

It can be written as a sum of positive squares in 8 ways, for example, as 78961 + 1098789904 = 281^2 + 33148^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098868865 - 2⁶ = 1098868801 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58394 + ... + 74883.

It is an arithmetic number, because the mean of its divisors is an integer number (88163397).

Almost surely, 2^1098868865 is an apocalyptic number.

It is an amenable number.

1098868865 is a deficient number, since it is larger than the sum of its proper divisors (311745487).

1098868865 is a wasteful number, since it uses less digits than its factorization.

1098868865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133396.

The product of its (nonzero) digits is 6635520, while the sum is 59.

The square root of 1098868865 is about 33149.1910157699. The cubic root of 1098868865 is about 1031.9261613261.

The spelling of 1098868865 in words is "one billion, ninety-eight million, eight hundred sixty-eight thousand, eight hundred sixty-five".