642796359965 has 4 divisors (see below), whose sum is σ = 771355631964. Its totient is φ = 514237087968.

The previous prime is 642796359901. The next prime is 642796359983. The reversal of 642796359965 is 569953697246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389468357476 + 253328002489 = 624074^2 + 503317^2 .

It is a cyclic number.

It is not a de Polignac number, because 642796359965 - 2⁶ = 642796359901 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 3 ways as a sum of consecutive naturals, for example, 64279635992 + ... + 64279636001.

It is an arithmetic number, because the mean of its divisors is an integer number (192838907991).

Almost surely, 2^642796359965 is an apocalyptic number.

It is an amenable number.

642796359965 is a deficient number, since it is larger than the sum of its proper divisors (128559271999).

642796359965 is a wasteful number, since it uses less digits than its factorization.

642796359965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128559271998.

The product of its digits is 661348800, while the sum is 71.

The spelling of 642796359965 in words is "six hundred forty-two billion, seven hundred ninety-six million, three hundred fifty-nine thousand, nine hundred sixty-five".