157566197 has 4 divisors (see below), whose sum is σ = 157612140. Its totient is φ = 157520256.

The previous prime is 157566181. The next prime is 157566203. The reversal of 157566197 is 791665751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107453956 + 50112241 = 10366^2 + 7079^2 .

It is a cyclic number.

It is not a de Polignac number, because 157566197 - 2⁴ = 157566181 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157566127) 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 3 ways as a sum of consecutive naturals, for example, 17372 + ... + 24837.

It is an arithmetic number, because the mean of its divisors is an integer number (39403035).

Almost surely, 2^157566197 is an apocalyptic number.

It is an amenable number.

157566197 is a deficient number, since it is larger than the sum of its proper divisors (45943).

157566197 is an equidigital number, since it uses as much as digits as its factorization.

157566197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45942.

The product of its digits is 396900, while the sum is 47.

The square root of 157566197 is about 12552.5374725591. The cubic root of 157566197 is about 540.1167980095.

The spelling of 157566197 in words is "one hundred fifty-seven million, five hundred sixty-six thousand, one hundred ninety-seven".