64564992551 has 2 divisors, whose sum is σ = 64564992552. Its totient is φ = 64564992550.

The previous prime is 64564992539. The next prime is 64564992581. The reversal of 64564992551 is 15529946546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64564992551 - 2³⁰ = 63491250727 is a prime.

It is a super-2 number, since 2×64564992551² (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 (64564992521) 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, 32282496275 + 32282496276.

It is an arithmetic number, because the mean of its divisors is an integer number (32282496276).

Almost surely, 2^64564992551 is an apocalyptic number.

64564992551 is a deficient number, since it is larger than the sum of its proper divisors (1).

64564992551 is an equidigital number, since it uses as much as digits as its factorization.

64564992551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664000, while the sum is 56.

The spelling of 64564992551 in words is "sixty-four billion, five hundred sixty-four million, nine hundred ninety-two thousand, five hundred fifty-one".