64665477 has 6 divisors (see below), whose sum is σ = 93405702. Its totient is φ = 43110312.

The previous prime is 64665457. The next prime is 64665481. The reversal of 64665477 is 77456646.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 50893956 + 13771521 = 7134^2 + 3711^2 .

It is not a de Polignac number, because 64665477 - 2⁶ = 64665413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64665407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3592518 + ... + 3592535.

It is an arithmetic number, because the mean of its divisors is an integer number (15567617).

Almost surely, 2^64665477 is an apocalyptic number.

It is an amenable number.

64665477 is a deficient number, since it is larger than the sum of its proper divisors (28740225).

64665477 is a wasteful number, since it uses less digits than its factorization.

64665477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7185059 (or 7185056 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 64665477 is about 8041.4847509648. The cubic root of 64665477 is about 401.3816326501.

The spelling of 64665477 in words is "sixty-four million, six hundred sixty-five thousand, four hundred seventy-seven".