18897481156 has 12 divisors (see below), whose sum is σ = 33077701692. Its totient is φ = 9446709248.

The previous prime is 18897481151. The next prime is 18897481157. The reversal of 18897481156 is 65118479881.

It can be written as a sum of positive squares in 2 ways, for example, as 10430536900 + 8466944256 = 102130^2 + 92016^2 .

It is a super-2 number, since 2×18897481156² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18897481156.

It is not an unprimeable number, because it can be changed into a prime (18897481151) 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, 486805 + ... + 524188.

It is an arithmetic number, because the mean of its divisors is an integer number (2756475141).

Almost surely, 2^18897481156 is an apocalyptic number.

It is an amenable number.

18897481156 is a deficient number, since it is larger than the sum of its proper divisors (14180220536).

18897481156 is a wasteful number, since it uses less digits than its factorization.

18897481156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015670 (or 1015668 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 58.

The spelling of 18897481156 in words is "eighteen billion, eight hundred ninety-seven million, four hundred eighty-one thousand, one hundred fifty-six".