64972511 has 4 divisors (see below), whose sum is σ = 66073800. Its totient is φ = 63871224.

The previous prime is 64972507. The next prime is 64972529. The reversal of 64972511 is 11527946.

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 64972511 - 2² = 64972507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64972561) 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, 550556 + ... + 550673.

It is an arithmetic number, because the mean of its divisors is an integer number (16518450).

Almost surely, 2^64972511 is an apocalyptic number.

64972511 is a deficient number, since it is larger than the sum of its proper divisors (1101289).

64972511 is a wasteful number, since it uses less digits than its factorization.

64972511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101288.

The product of its digits is 15120, while the sum is 35.

The square root of 64972511 is about 8060.5527726081. The cubic root of 64972511 is about 402.0158880052.

The spelling of 64972511 in words is "sixty-four million, nine hundred seventy-two thousand, five hundred eleven".