31145665643 has 16 divisors (see below), whose sum is σ = 33233316480. Its totient is φ = 29086646400.

The previous prime is 31145665633. The next prime is 31145665667. The reversal of 31145665643 is 34656654113.

It is not a de Polignac number, because 31145665643 - 2³⁴ = 13965796459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31145665594 and 31145665603.

It is not an unprimeable number, because it can be changed into a prime (31145665633) 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, 8436428 + ... + 8440118.

It is an arithmetic number, because the mean of its divisors is an integer number (2077082280).

Almost surely, 2^31145665643 is an apocalyptic number.

31145665643 is a deficient number, since it is larger than the sum of its proper divisors (2087650837).

31145665643 is a wasteful number, since it uses less digits than its factorization.

31145665643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7418.

The product of its digits is 777600, while the sum is 44.

The spelling of 31145665643 in words is "thirty-one billion, one hundred forty-five million, six hundred sixty-five thousand, six hundred forty-three".