165623406031 has 4 divisors (see below), whose sum is σ = 169475113192. Its totient is φ = 161771698872.

The previous prime is 165623406023. The next prime is 165623406037. The reversal of 165623406031 is 130604326561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165623406031 - 2³ = 165623406023 is a prime.

It is a super-2 number, since 2×165623406031² (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 (165623406037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1925853516 + ... + 1925853601.

It is an arithmetic number, because the mean of its divisors is an integer number (42368778298).

Almost surely, 2^165623406031 is an apocalyptic number.

165623406031 is a deficient number, since it is larger than the sum of its proper divisors (3851707161).

165623406031 is an equidigital number, since it uses as much as digits as its factorization.

165623406031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851707160.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 165623406031 in words is "one hundred sixty-five billion, six hundred twenty-three million, four hundred six thousand, thirty-one".