64977047497 has 2 divisors, whose sum is σ = 64977047498. Its totient is φ = 64977047496.

The previous prime is 64977047477. The next prime is 64977047501. The reversal of 64977047497 is 79474077946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64548516096 + 428531401 = 254064^2 + 20701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64977047497 is a prime.

It is not a weakly prime, because it can be changed into another prime (64977047407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32488523748 + 32488523749.

It is an arithmetic number, because the mean of its divisors is an integer number (32488523749).

Almost surely, 2^64977047497 is an apocalyptic number.

It is an amenable number.

64977047497 is a deficient number, since it is larger than the sum of its proper divisors (1).

64977047497 is an equidigital number, since it uses as much as digits as its factorization.

64977047497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74680704, while the sum is 64.

The spelling of 64977047497 in words is "sixty-four billion, nine hundred seventy-seven million, forty-seven thousand, four hundred ninety-seven".