51664653 has 6 divisors (see below), whose sum is σ = 74626734. Its totient is φ = 34443096.

The previous prime is 51664637. The next prime is 51664661. The reversal of 51664653 is 35646615.

51664653 is a `hidden beast` number, since 5 + 1 + 6 + 646 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36942084 + 14722569 = 6078^2 + 3837^2 .

It is not a de Polignac number, because 51664653 - 2⁴ = 51664637 is a prime.

It is a super-2 number, since 2×51664653² = 5338472739220818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51664663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2870250 + ... + 2870267.

It is an arithmetic number, because the mean of its divisors is an integer number (12437789).

Almost surely, 2^51664653 is an apocalyptic number.

It is an amenable number.

51664653 is a deficient number, since it is larger than the sum of its proper divisors (22962081).

51664653 is a wasteful number, since it uses less digits than its factorization.

51664653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5740523 (or 5740520 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 51664653 is about 7187.8128105843. The cubic root of 51664653 is about 372.4470215784.

The spelling of 51664653 in words is "fifty-one million, six hundred sixty-four thousand, six hundred fifty-three".