18168149390 has 128 divisors (see below), whose sum is σ = 37035532800. Its totient is φ = 6383534080.

The previous prime is 18168149387. The next prime is 18168149393. The reversal of 18168149390 is 9394186181.

It is an interprime number because it is at equal distance from previous prime (18168149387) and next prime (18168149393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168149393) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20621750 + ... + 20622630.

It is an arithmetic number, because the mean of its divisors is an integer number (289340100).

Almost surely, 2^18168149390 is an apocalyptic number.

18168149390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18168149390 is an abundant number, since it is smaller than the sum of its proper divisors (18867383410).

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

18168149390 is a wasteful number, since it uses less digits than its factorization.

18168149390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 18168149390 in words is "eighteen billion, one hundred sixty-eight million, one hundred forty-nine thousand, three hundred ninety".