64977943 has 2 divisors, whose sum is σ = 64977944. Its totient is φ = 64977942.

The previous prime is 64977931. The next prime is 64977977. The reversal of 64977943 is 34977946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64977943 - 2²¹ = 62880791 is a prime.

It is a super-2 number, since 2×64977943² = 8444266153022498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64977443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32488971 + 32488972.

It is an arithmetic number, because the mean of its divisors is an integer number (32488972).

Almost surely, 2^64977943 is an apocalyptic number.

64977943 is a deficient number, since it is larger than the sum of its proper divisors (1).

64977943 is an equidigital number, since it uses as much as digits as its factorization.

64977943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 49.

The square root of 64977943 is about 8060.8897151617. The cubic root of 64977943 is about 402.0270911505.

The spelling of 64977943 in words is "sixty-four million, nine hundred seventy-seven thousand, nine hundred forty-three".