18911211480 has 768 divisors, whose sum is σ = 78931584000. Its totient is φ = 3934033920.

The previous prime is 18911211457. The next prime is 18911211481. The reversal of 18911211480 is 8411211981.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18911211481) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 138037972 + ... + 138038108.

It is an arithmetic number, because the mean of its divisors is an integer number (102775500).

Almost surely, 2^18911211480 is an apocalyptic number.

18911211480 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 18911211480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39465792000).

18911211480 is an abundant number, since it is smaller than the sum of its proper divisors (60020372520).

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

18911211480 is a wasteful number, since it uses less digits than its factorization.

18911211480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The spelling of 18911211480 in words is "eighteen billion, nine hundred eleven million, two hundred eleven thousand, four hundred eighty".