18955574440 has 72 divisors (see below), whose sum is σ = 46903499370. Its totient is φ = 6889453120.

The previous prime is 18955574431. The next prime is 18955574507. The reversal of 18955574440 is 4447555981.

It can be written as a sum of positive squares in only one way, i.e., 17060016996 + 1895557444 = 130614^2 + 43538^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9577371 + ... + 9579349.

Almost surely, 2^18955574440 is an apocalyptic number.

18955574440 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 18955574440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23451749685).

18955574440 is an abundant number, since it is smaller than the sum of its proper divisors (27947924930).

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

18955574440 is an equidigital number, since it uses as much as digits as its factorization.

18955574440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991 (or 1997 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 52.

It can be divided in two parts, 18955 and 574440, that added together give a palindrome (593395).

The spelling of 18955574440 in words is "eighteen billion, nine hundred fifty-five million, five hundred seventy-four thousand, four hundred forty".