165166026631 has 4 divisors (see below), whose sum is σ = 165780027000. Its totient is φ = 164552026264.

The previous prime is 165166026617. The next prime is 165166026661. The reversal of 165166026631 is 136620661561.

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 165166026631 - 2¹³ = 165166018439 is a prime.

It is a super-2 number, since 2×165166026631² (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 (165166026661) 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, 306999781 + ... + 307000318.

It is an arithmetic number, because the mean of its divisors is an integer number (41445006750).

Almost surely, 2^165166026631 is an apocalyptic number.

165166026631 is a deficient number, since it is larger than the sum of its proper divisors (614000369).

165166026631 is an equidigital number, since it uses as much as digits as its factorization.

165166026631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614000368.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 165166026631 in words is "one hundred sixty-five billion, one hundred sixty-six million, twenty-six thousand, six hundred thirty-one".