156920018 has 4 divisors (see below), whose sum is σ = 235380030. Its totient is φ = 78460008.

The previous prime is 156920017. The next prime is 156920021. The reversal of 156920018 is 810029651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810029651 = 17 ⋅47648803.

It can be written as a sum of positive squares in only one way, i.e., 146724769 + 10195249 = 12113^2 + 3193^2 .

It is not an unprimeable number, because it can be changed into a prime (156920017) 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, 39230003 + ... + 39230006.

Almost surely, 2^156920018 is an apocalyptic number.

156920018 is a deficient number, since it is larger than the sum of its proper divisors (78460012).

156920018 is an equidigital number, since it uses as much as digits as its factorization.

156920018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78460011.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 156920018 is about 12526.7720502929. The cubic root of 156920018 is about 539.3774467006.

Adding to 156920018 its reverse (810029651), we get a palindrome (966949669).

The spelling of 156920018 in words is "one hundred fifty-six million, nine hundred twenty thousand, eighteen".