16555005551 has 16 divisors (see below), whose sum is σ = 19006793280. Its totient is φ = 14125017600.

The previous prime is 16555005541. The next prime is 16555005563. The reversal of 16555005551 is 15550055561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16555005551 - 2⁶ = 16555005487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555005541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2325185 + ... + 2332293.

It is an arithmetic number, because the mean of its divisors is an integer number (1187924580).

Almost surely, 2^16555005551 is an apocalyptic number.

16555005551 is a deficient number, since it is larger than the sum of its proper divisors (2451787729).

16555005551 is a wasteful number, since it uses less digits than its factorization.

16555005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8594.

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 16555005551 in words is "sixteen billion, five hundred fifty-five million, five thousand, five hundred fifty-one".