161655650 has 24 divisors (see below), whose sum is σ = 323810004. Its totient is φ = 59688000.

The previous prime is 161655631. The next prime is 161655677. The reversal of 161655650 is 56556161.

It can be written as a sum of positive squares in 6 ways, for example, as 40589641 + 121066009 = 6371^2 + 11003^2 .

It is a super-2 number, since 2×161655650² = 52265098353845000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161655650.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123701 + ... + 125000.

Almost surely, 2^161655650 is an apocalyptic number.

161655650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161655650 is an abundant number, since it is smaller than the sum of its proper divisors (162154354).

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

161655650 is a wasteful number, since it uses less digits than its factorization.

161655650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248726 (or 248721 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 161655650 is about 12714.3875196566. The cubic root of 161655650 is about 544.7496535587.

The spelling of 161655650 in words is "one hundred sixty-one million, six hundred fifty-five thousand, six hundred fifty".