64653551 has 4 divisors (see below), whose sum is σ = 64672104. Its totient is φ = 64635000.

The previous prime is 64653517. The next prime is 64653559. The reversal of 64653551 is 15535646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64653551 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 (64653559) 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, 2300 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (16168026).

Almost surely, 2^64653551 is an apocalyptic number.

64653551 is a deficient number, since it is larger than the sum of its proper divisors (18553).

64653551 is a wasteful number, since it uses less digits than its factorization.

64653551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18552.

The product of its digits is 54000, while the sum is 35.

The square root of 64653551 is about 8040.7431870443. The cubic root of 64653551 is about 401.3569560536.

The spelling of 64653551 in words is "sixty-four million, six hundred fifty-three thousand, five hundred fifty-one".