16005546551 has 4 divisors (see below), whose sum is σ = 16007049912. Its totient is φ = 16004043192.

The previous prime is 16005546527. The next prime is 16005546569. The reversal of 16005546551 is 15564550061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15564550061 = 313 ⋅49726997.

It is a cyclic number.

It is not a de Polignac number, because 16005546551 - 2²⁶ = 15938437687 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 (16005536551) 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, 735596 + ... + 757041.

It is an arithmetic number, because the mean of its divisors is an integer number (4001762478).

Almost surely, 2^16005546551 is an apocalyptic number.

16005546551 is a deficient number, since it is larger than the sum of its proper divisors (1503361).

16005546551 is a wasteful number, since it uses less digits than its factorization.

16005546551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503360.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 16005546551 in words is "sixteen billion, five million, five hundred forty-six thousand, five hundred fifty-one".