16551621084 has 24 divisors (see below), whose sum is σ = 38636535168. Its totient is φ = 5514909040.

The previous prime is 16551621041. The next prime is 16551621113. The reversal of 16551621084 is 48012615561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257112 + ... + 314975.

It is an arithmetic number, because the mean of its divisors is an integer number (1609855632).

Almost surely, 2^16551621084 is an apocalyptic number.

It is an amenable number.

16551621084 is an abundant number, since it is smaller than the sum of its proper divisors (22084914084).

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

16551621084 is a wasteful number, since it uses less digits than its factorization.

16551621084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574505 (or 574503 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 16551621084 in words is "sixteen billion, five hundred fifty-one million, six hundred twenty-one thousand, eighty-four".