16643404474 has 32 divisors (see below), whose sum is σ = 26255877120. Its totient is φ = 7905289392.

The previous prime is 16643404441. The next prime is 16643404487. The reversal of 16643404474 is 47440434661.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 16643404474.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436917 + ... + 473479.

It is an arithmetic number, because the mean of its divisors is an integer number (820496160).

Almost surely, 2^16643404474 is an apocalyptic number.

16643404474 is a deficient number, since it is larger than the sum of its proper divisors (9612472646).

16643404474 is a wasteful number, since it uses less digits than its factorization.

16643404474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36754.

The product of its (nonzero) digits is 774144, while the sum is 43.

The spelling of 16643404474 in words is "sixteen billion, six hundred forty-three million, four hundred four thousand, four hundred seventy-four".