157599986 has 4 divisors (see below), whose sum is σ = 236399982. Its totient is φ = 78799992.

The previous prime is 157599961. The next prime is 157599989. The reversal of 157599986 is 689995751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689995751 = 11831 ⋅58321.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 25694761 = 11485^2 + 5069^2 .

It is not an unprimeable number, because it can be changed into a prime (157599989) 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 as a sum of consecutive naturals, namely, 39399995 + ... + 39399998.

Almost surely, 2^157599986 is an apocalyptic number.

157599986 is a deficient number, since it is larger than the sum of its proper divisors (78799996).

157599986 is an equidigital number, since it uses as much as digits as its factorization.

157599986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78799995.

The product of its digits is 6123600, while the sum is 59.

The square root of 157599986 is about 12553.8833035838. The cubic root of 157599986 is about 540.1554033755.

The spelling of 157599986 in words is "one hundred fifty-seven million, five hundred ninety-nine thousand, nine hundred eighty-six".