642925986513 has 8 divisors (see below), whose sum is σ = 857251008768. Its totient is φ = 428609144304.

The previous prime is 642925986497. The next prime is 642925986539. The reversal of 642925986513 is 315689529246.

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

It is not a de Polignac number, because 642925986513 - 2⁴ = 642925986497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642925986553) 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, 1859206 + ... + 2177727.

It is an arithmetic number, because the mean of its divisors is an integer number (107156376096).

Almost surely, 2^642925986513 is an apocalyptic number.

It is an amenable number.

642925986513 is a deficient number, since it is larger than the sum of its proper divisors (214325022255).

642925986513 is a wasteful number, since it uses less digits than its factorization.

642925986513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090023.

The product of its digits is 27993600, while the sum is 60.

The spelling of 642925986513 in words is "six hundred forty-two billion, nine hundred twenty-five million, nine hundred eighty-six thousand, five hundred thirteen".