16551806564415 has 16 divisors (see below), whose sum is σ = 26745097342176. Its totient is φ = 8740227888000.

The previous prime is 16551806564291. The next prime is 16551806564443. The reversal of 16551806564415 is 51446560815561.

It is not a de Polignac number, because 16551806564415 - 2⁸ = 16551806564159 is a prime.

It is a super-2 number, since 2×16551806564415² (a number of 27 digits) contains 22 as substring.

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, 5462640916 + ... + 5462643945.

It is an arithmetic number, because the mean of its divisors is an integer number (1671568583886).

Almost surely, 2^{16551806564415} is an apocalyptic number.

16551806564415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16551806564415 is a deficient number, since it is larger than the sum of its proper divisors (10193290777761).

16551806564415 is a wasteful number, since it uses less digits than its factorization.

16551806564415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10925284970.

The product of its (nonzero) digits is 17280000, while the sum is 57.

The spelling of 16551806564415 in words is "sixteen trillion, five hundred fifty-one billion, eight hundred six million, five hundred sixty-four thousand, four hundred fifteen".