64156517 has 2 divisors, whose sum is σ = 64156518. Its totient is φ = 64156516.

The previous prime is 64156511. The next prime is 64156571. The reversal of 64156517 is 71565146.

Together with next prime (64156571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58232161 + 5924356 = 7631^2 + 2434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64156517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64156511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32078258 + 32078259.

It is an arithmetic number, because the mean of its divisors is an integer number (32078259).

Almost surely, 2^64156517 is an apocalyptic number.

It is an amenable number.

64156517 is a deficient number, since it is larger than the sum of its proper divisors (1).

64156517 is an equidigital number, since it uses as much as digits as its factorization.

64156517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 35.

The square root of 64156517 is about 8009.7763389498. The cubic root of 64156517 is about 400.3258116282.

The spelling of 64156517 in words is "sixty-four million, one hundred fifty-six thousand, five hundred seventeen".