64516651 has 4 divisors (see below), whose sum is σ = 64542472. Its totient is φ = 64490832.

The previous prime is 64516631. The next prime is 64516663. The reversal of 64516651 is 15661546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64516651 - 2⁷ = 64516523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64516601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8706 + ... + 14311.

It is an arithmetic number, because the mean of its divisors is an integer number (16135618).

Almost surely, 2^64516651 is an apocalyptic number.

64516651 is a deficient number, since it is larger than the sum of its proper divisors (25821).

64516651 is a wasteful number, since it uses less digits than its factorization.

64516651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25820.

The product of its digits is 21600, while the sum is 34.

The square root of 64516651 is about 8032.2257811892. The cubic root of 64516651 is about 401.0734728132.

The spelling of 64516651 in words is "sixty-four million, five hundred sixteen thousand, six hundred fifty-one".