18857751780872 has 16 divisors (see below), whose sum is σ = 35708366616300. Its totient is φ = 9335520683200.

The previous prime is 18857751780869. The next prime is 18857751780877. The reversal of 18857751780872 is 27808715775881.

It can be written as a sum of positive squares in 2 ways, for example, as 17318698157476 + 1539053623396 = 4161574^2 + 1240586^2 .

It is a super-2 number, since 2×18857751780872² (a number of 27 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 18857751780872.

It is not an unprimeable number, because it can be changed into a prime (18857751780877) 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, 11669400047 + ... + 11669401662.

Almost surely, 2^{18857751780872} is an apocalyptic number.

It is an amenable number.

18857751780872 is a deficient number, since it is larger than the sum of its proper divisors (16850614835428).

18857751780872 is a wasteful number, since it uses less digits than its factorization.

18857751780872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23338801816 (or 23338801812 counting only the distinct ones).

The product of its (nonzero) digits is 491724800, while the sum is 74.

The spelling of 18857751780872 in words is "eighteen trillion, eight hundred fifty-seven billion, seven hundred fifty-one million, seven hundred eighty thousand, eight hundred seventy-two".