642731137245 has 32 divisors (see below), whose sum is σ = 1142747101440. Its totient is φ = 342755749440.

The previous prime is 642731137231. The next prime is 642731137249. The reversal of 642731137245 is 542731137246.

It is a happy number.

642731137245 is a `hidden beast` number, since 6 + 4 + 273 + 1 + 1 + 372 + 4 + 5 = 666.

It is not a de Polignac number, because 642731137245 - 2²⁰ = 642730088669 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 642731137245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642731137249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1151035 + ... + 1615655.

It is an arithmetic number, because the mean of its divisors is an integer number (35710846920).

Almost surely, 2^642731137245 is an apocalyptic number.

It is an amenable number.

642731137245 is a deficient number, since it is larger than the sum of its proper divisors (500015964195).

642731137245 is a wasteful number, since it uses less digits than its factorization.

642731137245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474882 (or 474876 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

Subtracting from 642731137245 its reverse (542731137246), we obtain a palindrome (99999999999).

The spelling of 642731137245 in words is "six hundred forty-two billion, seven hundred thirty-one million, one hundred thirty-seven thousand, two hundred forty-five".