64632253551 has 4 divisors (see below), whose sum is σ = 86176338072. Its totient is φ = 43088169032.

The previous prime is 64632253523. The next prime is 64632253579. The reversal of 64632253551 is 15535223646.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (64632253523) and next prime (64632253579).

It is a cyclic number.

It is not a de Polignac number, because 64632253551 - 2¹⁷ = 64632122479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64632253151) 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, 10772042256 + ... + 10772042261.

It is an arithmetic number, because the mean of its divisors is an integer number (21544084518).

Almost surely, 2^64632253551 is an apocalyptic number.

64632253551 is a deficient number, since it is larger than the sum of its proper divisors (21544084521).

64632253551 is a wasteful number, since it uses less digits than its factorization.

64632253551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21544084520.

The product of its digits is 648000, while the sum is 42.

The spelling of 64632253551 in words is "sixty-four billion, six hundred thirty-two million, two hundred fifty-three thousand, five hundred fifty-one".