51664523 has 2 divisors, whose sum is σ = 51664524. Its totient is φ = 51664522.

The previous prime is 51664517. The next prime is 51664537. The reversal of 51664523 is 32546615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51664523 - 2⁸ = 51664267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51664523.

It is not a weakly prime, because it can be changed into another prime (51624523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25832261 + 25832262.

It is an arithmetic number, because the mean of its divisors is an integer number (25832262).

Almost surely, 2^51664523 is an apocalyptic number.

51664523 is a deficient number, since it is larger than the sum of its proper divisors (1).

51664523 is an equidigital number, since it uses as much as digits as its factorization.

51664523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 51664523 is about 7187.8037674939. The cubic root of 51664523 is about 372.4467091910.

The spelling of 51664523 in words is "fifty-one million, six hundred sixty-four thousand, five hundred twenty-three".