664234551 has 36 divisors (see below), whose sum is σ = 1008451080. Its totient is φ = 421178400.

The previous prime is 664234513. The next prime is 664234579. The reversal of 664234551 is 155432466.

664234551 is a `hidden beast` number, since 6 + 642 + 3 + 4 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 664234551 - 2¹⁰ = 664233527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664234451) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 526960 + ... + 528218.

It is an arithmetic number, because the mean of its divisors is an integer number (28012530).

Almost surely, 2^664234551 is an apocalyptic number.

664234551 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

664234551 is a deficient number, since it is larger than the sum of its proper divisors (344216529).

664234551 is a wasteful number, since it uses less digits than its factorization.

664234551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388 (or 1354 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 664234551 is about 25772.7482236567. The cubic root of 664234551 is about 872.5168458966.

The spelling of 664234551 in words is "six hundred sixty-four million, two hundred thirty-four thousand, five hundred fifty-one".