161661111795 has 56 divisors (see below), whose sum is σ = 292065409152. Its totient is φ = 85861036800.

The previous prime is 161661111761. The next prime is 161661111803. The reversal of 161661111795 is 597111166161.

161661111795 is a `hidden beast` number, since 1 + 6 + 16 + 611 + 1 + 17 + 9 + 5 = 666.

It is not a de Polignac number, because 161661111795 - 2⁸ = 161661111539 is a prime.

It is a super-2 number, since 2×161661111795² (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 self number, because there is not a number n which added to its sum of digits gives 161661111795.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 786430 + ... + 970460.

Almost surely, 2^161661111795 is an apocalyptic number.

161661111795 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161661111795 is a deficient number, since it is larger than the sum of its proper divisors (130404297357).

161661111795 is an equidigital number, since it uses as much as digits as its factorization.

161661111795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184295 (or 184280 counting only the distinct ones).

The product of its digits is 68040, while the sum is 45.

The spelling of 161661111795 in words is "one hundred sixty-one billion, six hundred sixty-one million, one hundred eleven thousand, seven hundred ninety-five".