16165666655650 has 12 divisors (see below), whose sum is σ = 30068139979602. Its totient is φ = 6466266662240.

The previous prime is 16165666655647. The next prime is 16165666655651. The reversal of 16165666655650 is 5655666656161.

It can be written as a sum of positive squares in 3 ways, for example, as 14313457255969 + 1852209399681 = 3783313^2 + 1360959^2 .

It is a super-2 number, since 2×16165666655650² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16165666655651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161656666507 + ... + 161656666606.

Almost surely, 2^{16165666655650} is an apocalyptic number.

16165666655650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16165666655650 is a deficient number, since it is larger than the sum of its proper divisors (13902473323952).

16165666655650 is a wasteful number, since it uses less digits than its factorization.

16165666655650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323313333125 (or 323313333120 counting only the distinct ones).

The product of its (nonzero) digits is 174960000, while the sum is 64.

The spelling of 16165666655650 in words is "sixteen trillion, one hundred sixty-five billion, six hundred sixty-six million, six hundred fifty-five thousand, six hundred fifty".