64994473651 has 2 divisors, whose sum is σ = 64994473652. Its totient is φ = 64994473650.

The previous prime is 64994473637. The next prime is 64994473681. The reversal of 64994473651 is 15637449946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64994473651 - 2⁹ = 64994473139 is a prime.

It is not a weakly prime, because it can be changed into another prime (64994473681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32497236825 + 32497236826.

It is an arithmetic number, because the mean of its divisors is an integer number (32497236826).

Almost surely, 2^64994473651 is an apocalyptic number.

64994473651 is a deficient number, since it is larger than the sum of its proper divisors (1).

64994473651 is an equidigital number, since it uses as much as digits as its factorization.

64994473651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 58.

The spelling of 64994473651 in words is "sixty-four billion, nine hundred ninety-four million, four hundred seventy-three thousand, six hundred fifty-one".