26620648357 has 2 divisors, whose sum is σ = 26620648358. Its totient is φ = 26620648356.

The previous prime is 26620648333. The next prime is 26620648363. The reversal of 26620648357 is 75384602662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20953720516 + 5666927841 = 144754^2 + 75279^2 .

It is a cyclic number.

It is not a de Polignac number, because 26620648357 - 2²³ = 26612259749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26620648357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26620618357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13310324178 + 13310324179.

It is an arithmetic number, because the mean of its divisors is an integer number (13310324179).

Almost surely, 2^26620648357 is an apocalyptic number.

It is an amenable number.

26620648357 is a deficient number, since it is larger than the sum of its proper divisors (1).

26620648357 is an equidigital number, since it uses as much as digits as its factorization.

26620648357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 26620648357 in words is "twenty-six billion, six hundred twenty million, six hundred forty-eight thousand, three hundred fifty-seven".