64516761 has 12 divisors (see below), whose sum is σ = 98095920. Its totient is φ = 40747320.

The previous prime is 64516747. The next prime is 64516763. The reversal of 64516761 is 16761546.

64516761 is a `hidden beast` number, since 645 + 1 + 6 + 7 + 6 + 1 = 666.

It is not a de Polignac number, because 64516761 - 2⁵ = 64516729 is a prime.

It is a super-2 number, since 2×64516761² = 8324824899862242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64516763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188475 + ... + 188816.

It is an arithmetic number, because the mean of its divisors is an integer number (8174660).

Almost surely, 2^64516761 is an apocalyptic number.

It is an amenable number.

64516761 is a deficient number, since it is larger than the sum of its proper divisors (33579159).

64516761 is a wasteful number, since it uses less digits than its factorization.

64516761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377316 (or 377313 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 64516761 is about 8032.2326286033. The cubic root of 64516761 is about 401.0737007546.

The spelling of 64516761 in words is "sixty-four million, five hundred sixteen thousand, seven hundred sixty-one".