64999477 has 2 divisors, whose sum is σ = 64999478. Its totient is φ = 64999476.

The previous prime is 64999457. The next prime is 64999481. The reversal of 64999477 is 77499946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63345681 + 1653796 = 7959^2 + 1286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64999477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64999427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32499738 + 32499739.

It is an arithmetic number, because the mean of its divisors is an integer number (32499739).

Almost surely, 2^64999477 is an apocalyptic number.

It is an amenable number.

64999477 is a deficient number, since it is larger than the sum of its proper divisors (1).

64999477 is an equidigital number, since it uses as much as digits as its factorization.

64999477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 55.

The square root of 64999477 is about 8062.2253131502. The cubic root of 64999477 is about 402.0714974767.

The spelling of 64999477 in words is "sixty-four million, nine hundred ninety-nine thousand, four hundred seventy-seven".