64377027257 has 2 divisors, whose sum is σ = 64377027258. Its totient is φ = 64377027256.

The previous prime is 64377027217. The next prime is 64377027271. The reversal of 64377027257 is 75272077346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64237409401 + 139617856 = 253451^2 + 11816^2 .

It is a cyclic number.

It is not a de Polignac number, because 64377027257 - 2⁶ = 64377027193 is a prime.

It is not a weakly prime, because it can be changed into another prime (64377027217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32188513628 + 32188513629.

It is an arithmetic number, because the mean of its divisors is an integer number (32188513629).

Almost surely, 2^64377027257 is an apocalyptic number.

It is an amenable number.

64377027257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64377027257 is an equidigital number, since it uses as much as digits as its factorization.

64377027257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3457440, while the sum is 50.

The spelling of 64377027257 in words is "sixty-four billion, three hundred seventy-seven million, twenty-seven thousand, two hundred fifty-seven".