51664612642425 has 36 divisors (see below), whose sum is σ = 97407433434480. Its totient is φ = 26104225332960.

The previous prime is 51664612642411. The next prime is 51664612642429. The reversal of 51664612642425 is 52424621646615.

51664612642425 is a `hidden beast` number, since 5 + 16 + 6 + 4 + 612 + 6 + 4 + 2 + 4 + 2 + 5 = 666.

It is not a de Polignac number, because 51664612642425 - 2⁸ = 51664612642169 is a prime.

It is a super-2 number, since 2×51664612642425² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51664612642429) 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, 6042640479 + ... + 6042649028.

Almost surely, 2^{51664612642425} is an apocalyptic number.

It is an amenable number.

51664612642425 is a deficient number, since it is larger than the sum of its proper divisors (45742820792055).

51664612642425 is a wasteful number, since it uses less digits than its factorization.

51664612642425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12085289542 (or 12085289534 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 54.

The spelling of 51664612642425 in words is "fifty-one trillion, six hundred sixty-four billion, six hundred twelve million, six hundred forty-two thousand, four hundred twenty-five".