161656653631 has 8 divisors (see below), whose sum is σ = 176429649744. Its totient is φ = 146896480320.

The previous prime is 161656653619. The next prime is 161656653637. The reversal of 161656653631 is 136356656161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161656653631 is a prime.

It is a super-2 number, since 2×161656653631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161656653637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3179326 + ... + 3229771.

It is an arithmetic number, because the mean of its divisors is an integer number (22053706218).

Almost surely, 2^161656653631 is an apocalyptic number.

161656653631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161656653631 is a deficient number, since it is larger than the sum of its proper divisors (14772996113).

161656653631 is a wasteful number, since it uses less digits than its factorization.

161656653631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6411401.

The product of its digits is 1749600, while the sum is 49.

The spelling of 161656653631 in words is "one hundred sixty-one billion, six hundred fifty-six million, six hundred fifty-three thousand, six hundred thirty-one".