51664305 has 64 divisors (see below), whose sum is σ = 105670656. Its totient is φ = 20928000.

The previous prime is 51664273. The next prime is 51664331. The reversal of 51664305 is 50346615.

It is not a de Polignac number, because 51664305 - 2⁵ = 51664273 is a prime.

It is a super-2 number, since 2×51664305² = 5338400822266050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46810 + ... + 47900.

It is an arithmetic number, because the mean of its divisors is an integer number (1651104).

Almost surely, 2^51664305 is an apocalyptic number.

51664305 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51664305 is an abundant number, since it is smaller than the sum of its proper divisors (54006351).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51664305 is a wasteful number, since it uses less digits than its factorization.

51664305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 51664305 is about 7187.7886029015. The cubic root of 51664305 is about 372.4461853403.

The spelling of 51664305 in words is "fifty-one million, six hundred sixty-four thousand, three hundred five".