63331621531 has 2 divisors, whose sum is σ = 63331621532. Its totient is φ = 63331621530.

The previous prime is 63331621487. The next prime is 63331621567. The reversal of 63331621531 is 13512613336.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63331621531 - 2¹⁵ = 63331588763 is a prime.

It is a super-2 number, since 2×63331621531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63331621631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31665810765 + 31665810766.

It is an arithmetic number, because the mean of its divisors is an integer number (31665810766).

Almost surely, 2^63331621531 is an apocalyptic number.

63331621531 is a deficient number, since it is larger than the sum of its proper divisors (1).

63331621531 is an equidigital number, since it uses as much as digits as its factorization.

63331621531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 34.

The spelling of 63331621531 in words is "sixty-three billion, three hundred thirty-one million, six hundred twenty-one thousand, five hundred thirty-one".