157801666 has 24 divisors (see below), whose sum is σ = 271498752. Its totient is φ = 68607000.

The previous prime is 157801639. The next prime is 157801697. The reversal of 157801666 is 666108751.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8610 + ... + 19741.

It is an arithmetic number, because the mean of its divisors is an integer number (11312448).

Almost surely, 2^157801666 is an apocalyptic number.

157801666 is a deficient number, since it is larger than the sum of its proper divisors (113697086).

157801666 is a wasteful number, since it uses less digits than its factorization.

157801666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28398 (or 28387 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 157801666 is about 12561.9133096834. The cubic root of 157801666 is about 540.3857166476.

The spelling of 157801666 in words is "one hundred fifty-seven million, eight hundred one thousand, six hundred sixty-six".