18103720667450 has 48 divisors (see below), whose sum is σ = 38667468471840. Its totient is φ = 6236688456000.

The previous prime is 18103720667437. The next prime is 18103720667489. The reversal of 18103720667450 is 5476602730181.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 866196281 + ... + 866217180.

It is an arithmetic number, because the mean of its divisors is an integer number (805572259830).

Almost surely, 2^{18103720667450} is an apocalyptic number.

18103720667450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18103720667450 is an abundant number, since it is smaller than the sum of its proper divisors (20563747804390).

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

18103720667450 is a wasteful number, since it uses less digits than its factorization.

18103720667450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732413503 (or 1732413498 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 18103720667450 in words is "eighteen trillion, one hundred three billion, seven hundred twenty million, six hundred sixty-seven thousand, four hundred fifty".