18412047481 has 9 divisors (see below), whose sum is σ = 19072914991. Its totient is φ = 17773349944.

The previous prime is 18412047461. The next prime is 18412047509. The reversal of 18412047481 is 18474021481.

The square root of 18412047481 is 135691.

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., 9654831081 + 8757216400 = 98259^2 + 93580^2 .

It is not a de Polignac number, because 18412047481 - 2²⁷ = 18277829753 is a prime.

It is a super-2 number, since 2×18412047481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18412047431) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3932700 + ... + 3937378.

Almost surely, 2^18412047481 is an apocalyptic number.

18412047481 is the 135691-st square number.

18412047481 is the 67846-th centered octagonal number.

It is an amenable number.

18412047481 is a deficient number, since it is larger than the sum of its proper divisors (660867510).

18412047481 is an frugal number, since it uses more digits than its factorization.

18412047481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9416 (or 4708 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The spelling of 18412047481 in words is "eighteen billion, four hundred twelve million, forty-seven thousand, four hundred eighty-one".