64659631 has 2 divisors, whose sum is σ = 64659632. Its totient is φ = 64659630.

The previous prime is 64659613. The next prime is 64659671. The reversal of 64659631 is 13695646.

Together with previous prime (64659613) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (64659671) can be obtained adding 64659631 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64659631 - 2⁵ = 64659599 is a prime.

It is a super-2 number, since 2×64659631² = 8361735762112322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64659611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32329815 + 32329816.

It is an arithmetic number, because the mean of its divisors is an integer number (32329816).

Almost surely, 2^64659631 is an apocalyptic number.

64659631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64659631 is an equidigital number, since it uses as much as digits as its factorization.

64659631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 64659631 is about 8041.1212526612. The cubic root of 64659631 is about 401.3695368207.

The spelling of 64659631 in words is "sixty-four million, six hundred fifty-nine thousand, six hundred thirty-one".