157198557 has 4 divisors (see below), whose sum is σ = 209598080. Its totient is φ = 104799036.

The previous prime is 157198543. The next prime is 157198577. The reversal of 157198557 is 755891751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 157198557 - 2⁶ = 157198493 is a prime.

It is a super-2 number, since 2×157198557² = 49422772645764498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157198577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26199757 + ... + 26199762.

It is an arithmetic number, because the mean of its divisors is an integer number (52399520).

Almost surely, 2^157198557 is an apocalyptic number.

It is an amenable number.

157198557 is a deficient number, since it is larger than the sum of its proper divisors (52399523).

157198557 is an equidigital number, since it uses as much as digits as its factorization.

157198557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52399522.

The product of its digits is 441000, while the sum is 48.

The square root of 157198557 is about 12537.8848694666. The cubic root of 157198557 is about 539.6963965528.

It can be divided in two parts, 1571 and 98557, that added together give a triangular number (100128 = T₄₄₇).

The spelling of 157198557 in words is "one hundred fifty-seven million, one hundred ninety-eight thousand, five hundred fifty-seven".