64651540631 has 2 divisors, whose sum is σ = 64651540632. Its totient is φ = 64651540630.

The previous prime is 64651540621. The next prime is 64651540637. The reversal of 64651540631 is 13604515646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64651540631 - 2⁶ = 64651540567 is a prime.

It is a super-2 number, since 2×64651540631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64651540637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32325770315 + 32325770316.

It is an arithmetic number, because the mean of its divisors is an integer number (32325770316).

Almost surely, 2^64651540631 is an apocalyptic number.

64651540631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64651540631 is an equidigital number, since it uses as much as digits as its factorization.

64651540631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 64651540631 in words is "sixty-four billion, six hundred fifty-one million, five hundred forty thousand, six hundred thirty-one".