64537080990761 has 2 divisors, whose sum is σ = 64537080990762. Its totient is φ = 64537080990760.

The previous prime is 64537080990671. The next prime is 64537080990791. The reversal of 64537080990761 is 16709908073546.

Together with previous prime (64537080990671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58075982977600 + 6461098013161 = 7620760^2 + 2541869^2 .

It is a cyclic number.

It is not a de Polignac number, because 64537080990761 - 2²⁶ = 64537013881897 is a prime.

It is not a weakly prime, because it can be changed into another prime (64537080990791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32268540495380 + 32268540495381.

It is an arithmetic number, because the mean of its divisors is an integer number (32268540495381).

Almost surely, 2^{64537080990761} is an apocalyptic number.

It is an amenable number.

64537080990761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64537080990761 is an equidigital number, since it uses as much as digits as its factorization.

64537080990761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68584320, while the sum is 65.

The spelling of 64537080990761 in words is "sixty-four trillion, five hundred thirty-seven billion, eighty million, nine hundred ninety thousand, seven hundred sixty-one".