161694523776 has 32 divisors (see below), whose sum is σ = 429501079800. Its totient is φ = 53898174464.

The previous prime is 161694523733. The next prime is 161694523777. The reversal of 161694523776 is 677325496161.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×161694523776² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161694523777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210539361 + ... + 210540128.

Almost surely, 2^161694523776 is an apocalyptic number.

161694523776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161694523776 is an abundant number, since it is smaller than the sum of its proper divisors (267806556024).

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

161694523776 is an equidigital number, since it uses as much as digits as its factorization.

161694523776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421079506 (or 421079494 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 57.

The spelling of 161694523776 in words is "one hundred sixty-one billion, six hundred ninety-four million, five hundred twenty-three thousand, seven hundred seventy-six".