157783240666 has 16 divisors (see below), whose sum is σ = 250608179880. Its totient is φ = 74247598080.

The previous prime is 157783240651. The next prime is 157783240679. The reversal of 157783240666 is 666042387751.

It can be written as a sum of positive squares in 4 ways, for example, as 129507136641 + 28276104025 = 359871^2 + 168155^2 .

It is a super-2 number, since 2×157783240666² (a number of 23 digits) contains 22 as substring.

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, 768826 + ... + 952186.

Almost surely, 2^157783240666 is an apocalyptic number.

157783240666 is a deficient number, since it is larger than the sum of its proper divisors (92824939214).

157783240666 is a wasteful number, since it uses less digits than its factorization.

157783240666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208689.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 157783240666 in words is "one hundred fifty-seven billion, seven hundred eighty-three million, two hundred forty thousand, six hundred sixty-six".