18415487700 has 252 divisors, whose sum is σ = 60334102780. Its totient is φ = 4876485120.

The previous prime is 18415487687. The next prime is 18415487707. The reversal of 18415487700 is 778451481.

It can be written as a sum of positive squares in 6 ways, for example, as 88284816 + 18327202884 = 9396^2 + 135378^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18415487707) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 11444496 + ... + 11446104.

Almost surely, 2^18415487700 is an apocalyptic number.

18415487700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18415487700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30167051390).

18415487700 is an abundant number, since it is smaller than the sum of its proper divisors (41918615080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18415487700 is a wasteful number, since it uses less digits than its factorization.

18415487700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798 (or 1776 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The spelling of 18415487700 in words is "eighteen billion, four hundred fifteen million, four hundred eighty-seven thousand, seven hundred".