51557663 has 2 divisors, whose sum is σ = 51557664. Its totient is φ = 51557662.

The previous prime is 51557657. The next prime is 51557699. The reversal of 51557663 is 36675515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51557663 - 2¹⁶ = 51492127 is a prime.

It is a super-2 number, since 2×51557663² = 5316385228043138, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3088883 and since 51557663 and 3088883 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51557603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778831 + 25778832.

It is an arithmetic number, because the mean of its divisors is an integer number (25778832).

Almost surely, 2^51557663 is an apocalyptic number.

51557663 is a deficient number, since it is larger than the sum of its proper divisors (1).

51557663 is an equidigital number, since it uses as much as digits as its factorization.

51557663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94500, while the sum is 38.

The square root of 51557663 is about 7180.3664948246. The cubic root of 51557663 is about 372.1897493251.

The spelling of 51557663 in words is "fifty-one million, five hundred fifty-seven thousand, six hundred sixty-three".