642760942765 has 8 divisors (see below), whose sum is σ = 790125646968. Its totient is φ = 501667077120.

The previous prime is 642760942709. The next prime is 642760942841. The reversal of 642760942765 is 567249067246.

642760942765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17138475396 + 625622467369 = 130914^2 + 790963^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-642760942765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1567709412 + ... + 1567709821.

It is an arithmetic number, because the mean of its divisors is an integer number (98765705871).

Almost surely, 2^642760942765 is an apocalyptic number.

It is an amenable number.

642760942765 is a deficient number, since it is larger than the sum of its proper divisors (147364704203).

642760942765 is a wasteful number, since it uses less digits than its factorization.

642760942765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135419279.

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 642760942765 in words is "six hundred forty-two billion, seven hundred sixty million, nine hundred forty-two thousand, seven hundred sixty-five".