20312500166639 has 4 divisors (see below), whose sum is σ = 20540730505680. Its totient is φ = 20084269827600.

The previous prime is 20312500166617. The next prime is 20312500166669. The reversal of 20312500166639 is 93666100521302.

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 20312500166639 - 2³² = 20308205199343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20312500166639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312500166669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114115169387 + ... + 114115169564.

It is an arithmetic number, because the mean of its divisors is an integer number (5135182626420).

Almost surely, 2^{20312500166639} is an apocalyptic number.

20312500166639 is a deficient number, since it is larger than the sum of its proper divisors (228230339041).

20312500166639 is an equidigital number, since it uses as much as digits as its factorization.

20312500166639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228230339040.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 20312500166639 in words is "twenty trillion, three hundred twelve billion, five hundred million, one hundred sixty-six thousand, six hundred thirty-nine".