63661344531 has 8 divisors (see below), whose sum is σ = 84899238144. Its totient is φ = 42432173640.

The previous prime is 63661344517. The next prime is 63661344569. The reversal of 63661344531 is 13544316636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63661344531 - 2⁵ = 63661344499 is a prime.

It is a super-2 number, since 2×63661344531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63661344631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2163631 + ... + 2192856.

It is an arithmetic number, because the mean of its divisors is an integer number (10612404768).

Almost surely, 2^63661344531 is an apocalyptic number.

63661344531 is a deficient number, since it is larger than the sum of its proper divisors (21237893613).

63661344531 is a wasteful number, since it uses less digits than its factorization.

63661344531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361361.

The product of its digits is 466560, while the sum is 42.

It can be divided in two parts, 6366134 and 4531, that added together give a triangular number (6370665 = T₃₅₆₉).

The spelling of 63661344531 in words is "sixty-three billion, six hundred sixty-one million, three hundred forty-four thousand, five hundred thirty-one".