18549061540 has 12 divisors (see below), whose sum is σ = 38953029276. Its totient is φ = 7419624608.

The previous prime is 18549061523. The next prime is 18549061561. The reversal of 18549061540 is 4516094581.

It can be written as a sum of positive squares in 2 ways, for example, as 12154180516 + 6394881024 = 110246^2 + 79968^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463726519 + ... + 463726558.

It is an arithmetic number, because the mean of its divisors is an integer number (3246085773).

Almost surely, 2^18549061540 is an apocalyptic number.

18549061540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18549061540 is an abundant number, since it is smaller than the sum of its proper divisors (20403967736).

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

18549061540 is a wasteful number, since it uses less digits than its factorization.

18549061540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927453086 (or 927453084 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 18549061540 in words is "eighteen billion, five hundred forty-nine million, sixty-one thousand, five hundred forty".