18047179540 has 96 divisors (see below), whose sum is σ = 42638109696. Its totient is φ = 6366497280.

The previous prime is 18047179537. The next prime is 18047179567. The reversal of 18047179540 is 4597174081.

It is a happy number.

It is a super-2 number, since 2×18047179540² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9644805 + ... + 9646675.

It is an arithmetic number, because the mean of its divisors is an integer number (444146976).

Almost surely, 2^18047179540 is an apocalyptic number.

18047179540 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 18047179540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21319054848).

18047179540 is an abundant number, since it is smaller than the sum of its proper divisors (24590930156).

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

18047179540 is a wasteful number, since it uses less digits than its factorization.

18047179540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529 (or 3527 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 18047179540 in words is "eighteen billion, forty-seven million, one hundred seventy-nine thousand, five hundred forty".