16400784906 has 48 divisors (see below), whose sum is σ = 40201263648. Its totient is φ = 4969933200.

The previous prime is 16400784889. The next prime is 16400784979. The reversal of 16400784906 is 60948700461.

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, 1528585 + ... + 1539276.

It is an arithmetic number, because the mean of its divisors is an integer number (837526326).

Almost surely, 2^16400784906 is an apocalyptic number.

16400784906 is an abundant number, since it is smaller than the sum of its proper divisors (23800478742).

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

16400784906 is a wasteful number, since it uses less digits than its factorization.

16400784906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3067889 (or 3067877 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 16400784906 in words is "sixteen billion, four hundred million, seven hundred eighty-four thousand, nine hundred six".