64855477 has 2 divisors, whose sum is σ = 64855478. Its totient is φ = 64855476.

The previous prime is 64855403. The next prime is 64855499. The reversal of 64855477 is 77455846.

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., 39363076 + 25492401 = 6274^2 + 5049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64855477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64855177) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32427738 + 32427739.

It is an arithmetic number, because the mean of its divisors is an integer number (32427739).

Almost surely, 2^64855477 is an apocalyptic number.

It is an amenable number.

64855477 is a deficient number, since it is larger than the sum of its proper divisors (1).

64855477 is an equidigital number, since it uses as much as digits as its factorization.

64855477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940800, while the sum is 46.

The square root of 64855477 is about 8053.2898246617. The cubic root of 64855477 is about 401.7743612175.

The spelling of 64855477 in words is "sixty-four million, eight hundred fifty-five thousand, four hundred seventy-seven".