645812903942 has 8 divisors (see below), whose sum is σ = 971417739600. Its totient is φ = 322006990744.

The previous prime is 645812903929. The next prime is 645812903987. The reversal of 645812903942 is 249309218546.

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

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, 449729717 + ... + 449731152.

It is an arithmetic number, because the mean of its divisors is an integer number (121427217450).

Almost surely, 2^645812903942 is an apocalyptic number.

645812903942 is a deficient number, since it is larger than the sum of its proper divisors (325604835658).

645812903942 is a wasteful number, since it uses less digits than its factorization.

645812903942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899461230.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 645812903942 in words is "six hundred forty-five billion, eight hundred twelve million, nine hundred three thousand, nine hundred forty-two".