523757579921 has 2 divisors, whose sum is σ = 523757579922. Its totient is φ = 523757579920.

The previous prime is 523757579899. The next prime is 523757579963. The reversal of 523757579921 is 129975757325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426702900625 + 97054679296 = 653225^2 + 311536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523757579921 is a prime.

It is not a weakly prime, because it can be changed into another prime (523757579221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261878789960 + 261878789961.

It is an arithmetic number, because the mean of its divisors is an integer number (261878789961).

Almost surely, 2^523757579921 is an apocalyptic number.

It is an amenable number.

523757579921 is a deficient number, since it is larger than the sum of its proper divisors (1).

523757579921 is an equidigital number, since it uses as much as digits as its factorization.

523757579921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41674500, while the sum is 62.

The spelling of 523757579921 in words is "five hundred twenty-three billion, seven hundred fifty-seven million, five hundred seventy-nine thousand, nine hundred twenty-one".