18399435350 has 24 divisors (see below), whose sum is σ = 35710906320. Its totient is φ = 7039783520.

The previous prime is 18399435349. The next prime is 18399435361. The reversal of 18399435350 is 5353499381.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7998605 + ... + 8000904.

It is an arithmetic number, because the mean of its divisors is an integer number (1487954430).

Almost surely, 2^18399435350 is an apocalyptic number.

18399435350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18399435350 is a deficient number, since it is larger than the sum of its proper divisors (17311470970).

18399435350 is a wasteful number, since it uses less digits than its factorization.

18399435350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15999544 (or 15999539 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 18399435350 in words is "eighteen billion, three hundred ninety-nine million, four hundred thirty-five thousand, three hundred fifty".