157238666 has 16 divisors (see below), whose sum is σ = 254404584. Its totient is φ = 72456384.

The previous prime is 157238639. The next prime is 157238671. The reversal of 157238666 is 666832751.

157238666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 137569441 + 19669225 = 11729^2 + 4435^2 .

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, 13136 + ... + 22068.

Almost surely, 2^157238666 is an apocalyptic number.

157238666 is a deficient number, since it is larger than the sum of its proper divisors (97165918).

157238666 is a wasteful number, since it uses less digits than its factorization.

157238666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9625.

The product of its digits is 362880, while the sum is 44.

The square root of 157238666 is about 12539.4842796664. The cubic root of 157238666 is about 539.7422935856.

It can be divided in two parts, 15723 and 8666, that added together give a cube (24389 = 29³).

The spelling of 157238666 in words is "one hundred fifty-seven million, two hundred thirty-eight thousand, six hundred sixty-six".