20877251579 has 2 divisors, whose sum is σ = 20877251580. Its totient is φ = 20877251578.

The previous prime is 20877251573. The next prime is 20877251609. The reversal of 20877251579 is 97515277802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20877251579 - 2¹² = 20877247483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20877251579.

It is not a weakly prime, because it can be changed into another prime (20877251573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10438625789 + 10438625790.

It is an arithmetic number, because the mean of its divisors is an integer number (10438625790).

Almost surely, 2^20877251579 is an apocalyptic number.

20877251579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877251579 is an equidigital number, since it uses as much as digits as its factorization.

20877251579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 20877251579 in words is "twenty billion, eight hundred seventy-seven million, two hundred fifty-one thousand, five hundred seventy-nine".