18349277128 has 128 divisors (see below), whose sum is σ = 43549228800. Its totient is φ = 7055133696.

The previous prime is 18349277083. The next prime is 18349277173. The reversal of 18349277128 is 82177294381.

It is an interprime number because it is at equal distance from previous prime (18349277083) and next prime (18349277173).

It is a super-2 number, since 2×18349277128² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4203475 + ... + 4207837.

It is an arithmetic number, because the mean of its divisors is an integer number (340228350).

Almost surely, 2^18349277128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18349277128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21774614400).

18349277128 is an abundant number, since it is smaller than the sum of its proper divisors (25199951672).

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

18349277128 is a wasteful number, since it uses less digits than its factorization.

18349277128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551 (or 4547 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 52.

The spelling of 18349277128 in words is "eighteen billion, three hundred forty-nine million, two hundred seventy-seven thousand, one hundred twenty-eight".