8641745631 has 16 divisors (see below), whose sum is σ = 12873325920. Its totient is φ = 5729330880.

The previous prime is 8641745627. The next prime is 8641745653. The reversal of 8641745631 is 1365471468.

8641745631 is a `hidden beast` number, since 8 + 6 + 4 + 1 + 7 + 4 + 5 + 631 = 666.

It is not a de Polignac number, because 8641745631 - 2² = 8641745627 is a prime.

It is a super-2 number, since 2×8641745631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8641749631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879270 + ... + 889043.

It is an arithmetic number, because the mean of its divisors is an integer number (804582870).

Almost surely, 2^8641745631 is an apocalyptic number.

8641745631 is a deficient number, since it is larger than the sum of its proper divisors (4231580289).

8641745631 is a wasteful number, since it uses less digits than its factorization.

8641745631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768503 (or 1768497 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 8641745631 is about 92960.9898344461. The cubic root of 8641745631 is about 2052.1093205498.

The spelling of 8641745631 in words is "eight billion, six hundred forty-one million, seven hundred forty-five thousand, six hundred thirty-one".