16621738356 has 12 divisors (see below), whose sum is σ = 38784056192. Its totient is φ = 5540579448.

The previous prime is 16621738351. The next prime is 16621738363. The reversal of 16621738356 is 65383712661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621738351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692572420 + ... + 692572443.

Almost surely, 2^16621738356 is an apocalyptic number.

It is an amenable number.

16621738356 is an abundant number, since it is smaller than the sum of its proper divisors (22162317836).

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

16621738356 is a wasteful number, since it uses less digits than its factorization.

16621738356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385144870 (or 1385144868 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The spelling of 16621738356 in words is "sixteen billion, six hundred twenty-one million, seven hundred thirty-eight thousand, three hundred fifty-six".