157170223809 has 27 divisors (see below), whose sum is σ = 229427990337. Its totient is φ = 103681991016.

The previous prime is 157170223799. The next prime is 157170223829. The reversal of 157170223809 is 908322071751.

The square root of 157170223809 is 396447.

It is a perfect power (a square), and thus also a powerful number.

157170223809 is a `hidden beast` number, since 1 + 571 + 70 + 2 + 2 + 3 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 157170223809 - 2⁹ = 157170223297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157170223829) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 122501482 + ... + 122502764.

Almost surely, 2^157170223809 is an apocalyptic number.

157170223809 is the 396447-th square number.

157170223809 is the 198224-th centered octagonal number.

It is an amenable number.

157170223809 is a deficient number, since it is larger than the sum of its proper divisors (72257766528).

157170223809 is an frugal number, since it uses more digits than its factorization.

157170223809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778 (or 1389 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 157170223809 in words is "one hundred fifty-seven billion, one hundred seventy million, two hundred twenty-three thousand, eight hundred nine".