20164356640531 has 8 divisors (see below), whose sum is σ = 21413476080720. Its totient is φ = 18934020951552.

The previous prime is 20164356640517. The next prime is 20164356640553. The reversal of 20164356640531 is 13504665346102.

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

It is a cyclic number.

It is not a de Polignac number, because 20164356640531 - 2⁵ = 20164356640499 is a prime.

It is a super-2 number, since 2×20164356640531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20164356640501) 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, 4695935590 + ... + 4695939883.

It is an arithmetic number, because the mean of its divisors is an integer number (2676684510090).

Almost surely, 2^{20164356640531} is an apocalyptic number.

20164356640531 is a deficient number, since it is larger than the sum of its proper divisors (1249119440189).

20164356640531 is a wasteful number, since it uses less digits than its factorization.

20164356640531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391875605.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 20164356640531 in words is "twenty trillion, one hundred sixty-four billion, three hundred fifty-six million, six hundred forty thousand, five hundred thirty-one".