64815944025653 has 2 divisors, whose sum is σ = 64815944025654. Its totient is φ = 64815944025652.

The previous prime is 64815944025629. The next prime is 64815944025667. The reversal of 64815944025653 is 35652044951846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64279712956369 + 536231069284 = 8017463^2 + 732278^2 .

It is a cyclic number.

It is not a de Polignac number, because 64815944025653 - 2¹² = 64815944021557 is a prime.

It is a super-2 number, since 2×64815944025653² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64815944028653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32407972012826 + 32407972012827.

It is an arithmetic number, because the mean of its divisors is an integer number (32407972012827).

Almost surely, 2^{64815944025653} is an apocalyptic number.

It is an amenable number.

64815944025653 is a deficient number, since it is larger than the sum of its proper divisors (1).

64815944025653 is an equidigital number, since it uses as much as digits as its factorization.

64815944025653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416000, while the sum is 62.

The spelling of 64815944025653 in words is "sixty-four trillion, eight hundred fifteen billion, nine hundred forty-four million, twenty-five thousand, six hundred fifty-three".