165650581023 has 8 divisors (see below), whose sum is σ = 220873615488. Its totient is φ = 110430633624.

The previous prime is 165650581003. The next prime is 165650581043. The reversal of 165650581023 is 320185056561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (165650581003) and next prime (165650581043).

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

It is not a de Polignac number, because 165650581023 - 2¹⁸ = 165650318879 is a prime.

It is a super-2 number, since 2×165650581023² (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 (165650581003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643515 + ... + 863372.

It is an arithmetic number, because the mean of its divisors is an integer number (27609201936).

Almost surely, 2^165650581023 is an apocalyptic number.

165650581023 is a deficient number, since it is larger than the sum of its proper divisors (55223034465).

165650581023 is a wasteful number, since it uses less digits than its factorization.

165650581023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543533.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 165650581023 in words is "one hundred sixty-five billion, six hundred fifty million, five hundred eighty-one thousand, twenty-three".