161168407920 has 120 divisors (see below), whose sum is σ = 582892442496. Its totient is φ = 39672221184.

The previous prime is 161168407919. The next prime is 161168407927. The reversal of 161168407920 is 29704861161.

161168407920 is a `hidden beast` number, since 1 + 61 + 168 + 407 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×161168407920² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161168407927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8600064 + ... + 8618783.

Almost surely, 2^161168407920 is an apocalyptic number.

161168407920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161168407920 is an abundant number, since it is smaller than the sum of its proper divisors (421724034576).

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

161168407920 is a wasteful number, since it uses less digits than its factorization.

161168407920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218879 (or 17218870 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 161168407920 in words is "one hundred sixty-one billion, one hundred sixty-eight million, four hundred seven thousand, nine hundred twenty".