18398719770 has 32 divisors (see below), whose sum is σ = 44184521088. Its totient is φ = 4903259328.

The previous prime is 18398719769. The next prime is 18398719771. The reversal of 18398719770 is 7791789381.

It is an interprime number because it is at equal distance from previous prime (18398719769) and next prime (18398719771).

It is not an unprimeable number, because it can be changed into a prime (18398719771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142609 + ... + 239028.

It is an arithmetic number, because the mean of its divisors is an integer number (1380766284).

Almost surely, 2^18398719770 is an apocalyptic number.

18398719770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18398719770 is an abundant number, since it is smaller than the sum of its proper divisors (25785801318).

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

18398719770 is a wasteful number, since it uses less digits than its factorization.

18398719770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383254.

The product of its (nonzero) digits is 5334336, while the sum is 60.

The spelling of 18398719770 in words is "eighteen billion, three hundred ninety-eight million, seven hundred nineteen thousand, seven hundred seventy".