8518220157 has 4 divisors (see below), whose sum is σ = 11357626880. Its totient is φ = 5678813436.

The previous prime is 8518220143. The next prime is 8518220159. The reversal of 8518220157 is 7510228158.

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 8518220157 - 2¹¹ = 8518218109 is a prime.

It is a super-2 number, since 2×8518220157² (a number of 21 digits) 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 (8518220159) 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, 1419703357 + ... + 1419703362.

It is an arithmetic number, because the mean of its divisors is an integer number (2839406720).

Almost surely, 2^8518220157 is an apocalyptic number.

It is an amenable number.

8518220157 is a deficient number, since it is larger than the sum of its proper divisors (2839406723).

8518220157 is a wasteful number, since it uses less digits than its factorization.

8518220157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839406722.

The product of its (nonzero) digits is 44800, while the sum is 39.

The square root of 8518220157 is about 92294.2043521694. The cubic root of 8518220157 is about 2042.2847141461.

The spelling of 8518220157 in words is "eight billion, five hundred eighteen million, two hundred twenty thousand, one hundred fifty-seven".