90207965675521 has 2 divisors, whose sum is σ = 90207965675522. Its totient is φ = 90207965675520.

The previous prime is 90207965675461. The next prime is 90207965675567. The reversal of 90207965675521 is 12557656970209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85378801204225 + 4829164471296 = 9240065^2 + 2197536^2 .

It is a cyclic number.

It is not a de Polignac number, because 90207965675521 - 2³⁷ = 90070526722049 is a prime.

It is not a weakly prime, because it can be changed into another prime (90207965673521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45103982837760 + 45103982837761.

It is an arithmetic number, because the mean of its divisors is an integer number (45103982837761).

Almost surely, 2^{90207965675521} is an apocalyptic number.

It is an amenable number.

90207965675521 is a deficient number, since it is larger than the sum of its proper divisors (1).

90207965675521 is an equidigital number, since it uses as much as digits as its factorization.

90207965675521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442000, while the sum is 64.

The spelling of 90207965675521 in words is "ninety trillion, two hundred seven billion, nine hundred sixty-five million, six hundred seventy-five thousand, five hundred twenty-one".