64646651 has 2 divisors, whose sum is σ = 64646652. Its totient is φ = 64646650.

The previous prime is 64646639. The next prime is 64646653. The reversal of 64646651 is 15664646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64646651 - 2¹⁰ = 64645627 is a prime.

Together with 64646653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64646653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32323325 + 32323326.

It is an arithmetic number, because the mean of its divisors is an integer number (32323326).

Almost surely, 2^64646651 is an apocalyptic number.

64646651 is a deficient number, since it is larger than the sum of its proper divisors (1).

64646651 is an equidigital number, since it uses as much as digits as its factorization.

64646651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The square root of 64646651 is about 8040.3141107795. The cubic root of 64646651 is about 401.3426775828.

The spelling of 64646651 in words is "sixty-four million, six hundred forty-six thousand, six hundred fifty-one".