16399861842 has 48 divisors (see below), whose sum is σ = 41089773312. Its totient is φ = 4325237280.

The previous prime is 16399861783. The next prime is 16399861853. The reversal of 16399861842 is 24816899361.

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, 2141634 + ... + 2149277.

It is an arithmetic number, because the mean of its divisors is an integer number (856036944).

Almost surely, 2^16399861842 is an apocalyptic number.

16399861842 is an abundant number, since it is smaller than the sum of its proper divisors (24689911470).

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

16399861842 is a wasteful number, since it uses less digits than its factorization.

16399861842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290943 (or 4290936 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 57.

The spelling of 16399861842 in words is "sixteen billion, three hundred ninety-nine million, eight hundred sixty-one thousand, eight hundred forty-two".