1661403810 has 48 divisors (see below), whose sum is σ = 4382820288. Its totient is φ = 402763680.

The previous prime is 1661403803. The next prime is 1661403839. The reversal of 1661403810 is 183041661.

It is a super-2 number, since 2×1661403810² = 5520525239765032200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225214 + ... + 232473.

It is an arithmetic number, because the mean of its divisors is an integer number (91308756).

Almost surely, 2^1661403810 is an apocalyptic number.

1661403810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661403810 is an abundant number, since it is smaller than the sum of its proper divisors (2721416478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661403810 is a wasteful number, since it uses less digits than its factorization.

1661403810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457719 (or 457708 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1661403810 is about 40760.3215149243. The cubic root of 1661403810 is about 1184.3818243098.

The spelling of 1661403810 in words is "one billion, six hundred sixty-one million, four hundred three thousand, eight hundred ten".