161091936975 has 12 divisors (see below), whose sum is σ = 266338669256. Its totient is φ = 85915699680.

The previous prime is 161091936961. The next prime is 161091936983. The reversal of 161091936975 is 579639190161.

It is not a de Polignac number, because 161091936975 - 2¹⁶ = 161091871439 is a prime.

It is a super-2 number, since 2×161091936975² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent 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, 1073946172 + ... + 1073946321.

Almost surely, 2^161091936975 is an apocalyptic number.

161091936975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161091936975 is a deficient number, since it is larger than the sum of its proper divisors (105246732281).

161091936975 is a wasteful number, since it uses less digits than its factorization.

161091936975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147892506 (or 2147892501 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 57.

The spelling of 161091936975 in words is "one hundred sixty-one billion, ninety-one million, nine hundred thirty-six thousand, nine hundred seventy-five".