75921864437 has 2 divisors, whose sum is σ = 75921864438. Its totient is φ = 75921864436.

The previous prime is 75921864433. The next prime is 75921864443. The reversal of 75921864437 is 73446812957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75273958321 + 647906116 = 274361^2 + 25454^2 .

It is a cyclic number.

It is not a de Polignac number, because 75921864437 - 2² = 75921864433 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75921864433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37960932218 + 37960932219.

It is an arithmetic number, because the mean of its divisors is an integer number (37960932219).

Almost surely, 2^75921864437 is an apocalyptic number.

It is an amenable number.

75921864437 is a deficient number, since it is larger than the sum of its proper divisors (1).

75921864437 is an equidigital number, since it uses as much as digits as its factorization.

75921864437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 56.

The spelling of 75921864437 in words is "seventy-five billion, nine hundred twenty-one million, eight hundred sixty-four thousand, four hundred thirty-seven".