157366809 has 12 divisors (see below), whose sum is σ = 233451556. Its totient is φ = 102075552.

The previous prime is 157366777. The next prime is 157366813. The reversal of 157366809 is 908663751.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 145443600 + 11923209 = 12060^2 + 3453^2 .

It is not a de Polignac number, because 157366809 - 2⁵ = 157366777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157366849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235954 + ... + 236619.

Almost surely, 2^157366809 is an apocalyptic number.

It is an amenable number.

157366809 is a deficient number, since it is larger than the sum of its proper divisors (76084747).

157366809 is a wasteful number, since it uses less digits than its factorization.

157366809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472616 (or 472613 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 157366809 is about 12544.5928192190. The cubic root of 157366809 is about 539.8888763110. Note that the first 4 decimals are identical.

The spelling of 157366809 in words is "one hundred fifty-seven million, three hundred sixty-six thousand, eight hundred nine".