642754213921 has 8 divisors (see below), whose sum is σ = 657426677760. Its totient is φ = 628207694352.

The previous prime is 642754213823. The next prime is 642754213943. The reversal of 642754213921 is 129312457246.

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

It is a cyclic number.

It is not a de Polignac number, because 642754213921 - 2³⁵ = 608394475553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642754213121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31475745 + ... + 31496158.

It is an arithmetic number, because the mean of its divisors is an integer number (82178334720).

Almost surely, 2^642754213921 is an apocalyptic number.

It is an amenable number.

642754213921 is a deficient number, since it is larger than the sum of its proper divisors (14672463839).

642754213921 is a wasteful number, since it uses less digits than its factorization.

642754213921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62972135.

The product of its digits is 725760, while the sum is 46.

The spelling of 642754213921 in words is "six hundred forty-two billion, seven hundred fifty-four million, two hundred thirteen thousand, nine hundred twenty-one".