64136557 has 2 divisors, whose sum is σ = 64136558. Its totient is φ = 64136556.

The previous prime is 64136543. The next prime is 64136561. The reversal of 64136557 is 75563146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54081316 + 10055241 = 7354^2 + 3171^2 .

It is a cyclic number.

It is not a de Polignac number, because 64136557 - 2¹⁵ = 64103789 is a prime.

It is a super-2 number, since 2×64136557² = 8226995887628498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64136057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32068278 + 32068279.

It is an arithmetic number, because the mean of its divisors is an integer number (32068279).

Almost surely, 2^64136557 is an apocalyptic number.

It is an amenable number.

64136557 is a deficient number, since it is larger than the sum of its proper divisors (1).

64136557 is an equidigital number, since it uses as much as digits as its factorization.

64136557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 37.

The square root of 64136557 is about 8008.5302646616. The cubic root of 64136557 is about 400.2842916478.

The spelling of 64136557 in words is "sixty-four million, one hundred thirty-six thousand, five hundred fifty-seven".