42091646668 has 24 divisors (see below), whose sum is σ = 76640896080. Its totient is φ = 20202638400.

The previous prime is 42091646651. The next prime is 42091646693. The reversal of 42091646668 is 86664619024.

It is a happy number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

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, 1028658 + ... + 1068793.

It is an arithmetic number, because the mean of its divisors is an integer number (3193370670).

Almost surely, 2^42091646668 is an apocalyptic number.

It is an amenable number.

42091646668 is a deficient number, since it is larger than the sum of its proper divisors (34549249412).

42091646668 is a wasteful number, since it uses less digits than its factorization.

42091646668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097657 (or 2097655 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 42091646668 in words is "forty-two billion, ninety-one million, six hundred forty-six thousand, six hundred sixty-eight".