16551946380 has 48 divisors (see below), whose sum is σ = 46444769280. Its totient is φ = 4404393408.

The previous prime is 16551946373. The next prime is 16551946391. The reversal of 16551946380 is 8364915561.

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, 267340 + ... + 323379.

It is an arithmetic number, because the mean of its divisors is an integer number (967599360).

Almost surely, 2^16551946380 is an apocalyptic number.

16551946380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16551946380 is an abundant number, since it is smaller than the sum of its proper divisors (29892822900).

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

16551946380 is a wasteful number, since it uses less digits than its factorization.

16551946380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591198 (or 591196 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 16551946380 in words is "sixteen billion, five hundred fifty-one million, nine hundred forty-six thousand, three hundred eighty".