16646378736 has 80 divisors (see below), whose sum is σ = 47562796064. Its totient is φ = 4983524352.

The previous prime is 16646378713. The next prime is 16646378747. The reversal of 16646378736 is 63787364661.

It is a congruent number.

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, 337411 + ... + 383586.

Almost surely, 2^16646378736 is an apocalyptic number.

16646378736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16646378736 is an abundant number, since it is smaller than the sum of its proper divisors (30916417328).

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

16646378736 is a wasteful number, since it uses less digits than its factorization.

16646378736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721058 (or 721052 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 57.

The spelling of 16646378736 in words is "sixteen billion, six hundred forty-six million, three hundred seventy-eight thousand, seven hundred thirty-six".