642215710747 has 12 divisors (see below), whose sum is σ = 695439741744. Its totient is φ = 592795126560.

The previous prime is 642215710729. The next prime is 642215710751. The reversal of 642215710747 is 747017512246.

It is not a de Polignac number, because 642215710747 - 2²³ = 642207322139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642215710697 and 642215710706.

It is not an unprimeable number, because it can be changed into a prime (642215710447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9189378 + ... + 9259000.

It is an arithmetic number, because the mean of its divisors is an integer number (57953311812).

Almost surely, 2^642215710747 is an apocalyptic number.

642215710747 is a deficient number, since it is larger than the sum of its proper divisors (53224030997).

642215710747 is a wasteful number, since it uses less digits than its factorization.

642215710747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124230 (or 124217 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 46.

The spelling of 642215710747 in words is "six hundred forty-two billion, two hundred fifteen million, seven hundred ten thousand, seven hundred forty-seven".