64577657 has 2 divisors, whose sum is σ = 64577658. Its totient is φ = 64577656.

The previous prime is 64577633. The next prime is 64577659. The reversal of 64577657 is 75677546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64577296 + 361 = 8036^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 64577657 - 2¹⁶ = 64512121 is a prime.

Together with 64577659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64577659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32288828 + 32288829.

It is an arithmetic number, because the mean of its divisors is an integer number (32288829).

Almost surely, 2^64577657 is an apocalyptic number.

It is an amenable number.

64577657 is a deficient number, since it is larger than the sum of its proper divisors (1).

64577657 is an equidigital number, since it uses as much as digits as its factorization.

64577657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234800, while the sum is 47.

The square root of 64577657 is about 8036.0224613922. The cubic root of 64577657 is about 401.1998493883.

The spelling of 64577657 in words is "sixty-four million, five hundred seventy-seven thousand, six hundred fifty-seven".