157215866 has 8 divisors (see below), whose sum is σ = 239054484. Its totient is φ = 77531040.

The previous prime is 157215859. The next prime is 157215871. The reversal of 157215866 is 668512751.

It can be written as a sum of positive squares in 2 ways, for example, as 154878025 + 2337841 = 12445^2 + 1529^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538265 + ... + 538556.

Almost surely, 2^157215866 is an apocalyptic number.

157215866 is a deficient number, since it is larger than the sum of its proper divisors (81838618).

157215866 is a wasteful number, since it uses less digits than its factorization.

157215866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076896.

The product of its digits is 100800, while the sum is 41.

The square root of 157215866 is about 12538.5751184096. The cubic root of 157215866 is about 539.7162043302.

The spelling of 157215866 in words is "one hundred fifty-seven million, two hundred fifteen thousand, eight hundred sixty-six".