157720255 has 32 divisors (see below), whose sum is σ = 237616128. Its totient is φ = 97632000.

The previous prime is 157720253. The next prime is 157720289. The reversal of 157720255 is 552027751.

It is not a de Polignac number, because 157720255 - 2¹ = 157720253 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157720255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157720253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56779 + ... + 59491.

It is an arithmetic number, because the mean of its divisors is an integer number (7425504).

Almost surely, 2^157720255 is an apocalyptic number.

157720255 is a deficient number, since it is larger than the sum of its proper divisors (79895873).

157720255 is a wasteful number, since it uses less digits than its factorization.

157720255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887.

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 157720255 is about 12558.6725015027. The cubic root of 157720255 is about 540.2927710526.

The spelling of 157720255 in words is "one hundred fifty-seven million, seven hundred twenty thousand, two hundred fifty-five".