20195013752639 has 4 divisors (see below), whose sum is σ = 22030924093800. Its totient is φ = 18359103411480.

The previous prime is 20195013752561. The next prime is 20195013752663. The reversal of 20195013752639 is 93625731059102.

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 20195013752639 - 2³² = 20190718785343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20195013742639) 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, 917955170564 + ... + 917955170585.

It is an arithmetic number, because the mean of its divisors is an integer number (5507731023450).

Almost surely, 2^{20195013752639} is an apocalyptic number.

20195013752639 is a deficient number, since it is larger than the sum of its proper divisors (1835910341161).

20195013752639 is a wasteful number, since it uses less digits than its factorization.

20195013752639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835910341160.

The product of its (nonzero) digits is 3061800, while the sum is 53.

The spelling of 20195013752639 in words is "twenty trillion, one hundred ninety-five billion, thirteen million, seven hundred fifty-two thousand, six hundred thirty-nine".