161655425533 has 12 divisors (see below), whose sum is σ = 192049175232. Its totient is φ = 135613668120.

The previous prime is 161655425521. The next prime is 161655425539. The reversal of 161655425533 is 335524556161.

It is not a de Polignac number, because 161655425533 - 2⁵ = 161655425501 is a prime.

It is a super-2 number, since 2×161655425533² (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 (161655425539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35094403 + ... + 35099008.

It is an arithmetic number, because the mean of its divisors is an integer number (16004097936).

Almost surely, 2^161655425533 is an apocalyptic number.

It is an amenable number.

161655425533 is a deficient number, since it is larger than the sum of its proper divisors (30393749699).

161655425533 is an equidigital number, since it uses as much as digits as its factorization.

161655425533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70193472 (or 70193465 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 46.

The spelling of 161655425533 in words is "one hundred sixty-one billion, six hundred fifty-five million, four hundred twenty-five thousand, five hundred thirty-three".