64911257 has 2 divisors, whose sum is σ = 64911258. Its totient is φ = 64911256.

The previous prime is 64911233. The next prime is 64911271. The reversal of 64911257 is 75211946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63425296 + 1485961 = 7964^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 64911257 - 2¹⁶ = 64845721 is a prime.

It is not a weakly prime, because it can be changed into another prime (64911757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32455628 + 32455629.

It is an arithmetic number, because the mean of its divisors is an integer number (32455629).

Almost surely, 2^64911257 is an apocalyptic number.

It is an amenable number.

64911257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64911257 is an equidigital number, since it uses as much as digits as its factorization.

64911257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 64911257 is about 8056.7522613023. The cubic root of 64911257 is about 401.8895123864.

The spelling of 64911257 in words is "sixty-four million, nine hundred eleven thousand, two hundred fifty-seven".