18866670736 has 45 divisors (see below), whose sum is σ = 38238198649. Its totient is φ = 9017146688.

The previous prime is 18866670709. The next prime is 18866670761. The reversal of 18866670736 is 63707666881.

The square root of 18866670736 is 137356.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16471155600 + 2395515136 = 128340^2 + 48944^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12636006 + ... + 12637498.

Almost surely, 2^18866670736 is an apocalyptic number.

18866670736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18866670736 is the 137356-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18866670736

18866670736 is an abundant number, since it is smaller than the sum of its proper divisors (19371527913).

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

18866670736 is an frugal number, since it uses more digits than its factorization.

18866670736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040 (or 1518 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 18866670736 in words is "eighteen billion, eight hundred sixty-six million, six hundred seventy thousand, seven hundred thirty-six".