216557157 has 4 divisors (see below), whose sum is σ = 288742880. Its totient is φ = 144371436.

The previous prime is 216557149. The next prime is 216557161. The reversal of 216557157 is 751755612.

216557157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216557157 - 2³ = 216557149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216557177) 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, 36092857 + ... + 36092862.

It is an arithmetic number, because the mean of its divisors is an integer number (72185720).

Almost surely, 2^216557157 is an apocalyptic number.

It is an amenable number.

216557157 is a deficient number, since it is larger than the sum of its proper divisors (72185723).

216557157 is an equidigital number, since it uses as much as digits as its factorization.

216557157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72185722.

The product of its digits is 73500, while the sum is 39.

The square root of 216557157 is about 14715.8811153121. The cubic root of 216557157 is about 600.5154431815.

The spelling of 216557157 in words is "two hundred sixteen million, five hundred fifty-seven thousand, one hundred fifty-seven".