157660209 has 16 divisors (see below), whose sum is σ = 266938240. Its totient is φ = 90091440.

The previous prime is 157660171. The next prime is 157660229. The reversal of 157660209 is 902066751.

157660209 is a `hidden beast` number, since 1 + 576 + 60 + 20 + 9 = 666.

It is not a de Polignac number, because 157660209 - 2¹³ = 157652017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157660229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416902 + ... + 417279.

It is an arithmetic number, because the mean of its divisors is an integer number (16683640).

Almost surely, 2^157660209 is an apocalyptic number.

It is an amenable number.

157660209 is a deficient number, since it is larger than the sum of its proper divisors (109278031).

157660209 is an equidigital number, since it uses as much as digits as its factorization.

157660209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834197 (or 834191 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 157660209 is about 12556.2816550124. The cubic root of 157660209 is about 540.2241970285.

The spelling of 157660209 in words is "one hundred fifty-seven million, six hundred sixty thousand, two hundred nine".