161617619610 has 24 divisors (see below), whose sum is σ = 420205811220. Its totient is φ = 43098031872.

The previous prime is 161617619567. The next prime is 161617619623. The reversal of 161617619610 is 16916716161.

161617619610 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 17 + 6 + 19 + 610 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 151686101961 + 9931517649 = 389469^2 + 99657^2 .

It is a super-2 number, since 2×161617619610² (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 Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897875575 + ... + 897875754.

Almost surely, 2^161617619610 is an apocalyptic number.

161617619610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161617619610 is an abundant number, since it is smaller than the sum of its proper divisors (258588191610).

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

161617619610 is a wasteful number, since it uses less digits than its factorization.

161617619610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795751342 (or 1795751339 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The spelling of 161617619610 in words is "one hundred sixty-one billion, six hundred seventeen million, six hundred nineteen thousand, six hundred ten".