16535522551 has 4 divisors (see below), whose sum is σ = 16537336704. Its totient is φ = 16533708400.

The previous prime is 16535522539. The next prime is 16535522561. The reversal of 16535522551 is 15522553561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16535522551 - 2⁵ = 16535522519 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 (16535522501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893335 + ... + 911656.

It is an arithmetic number, because the mean of its divisors is an integer number (4134334176).

Almost surely, 2^16535522551 is an apocalyptic number.

16535522551 is a deficient number, since it is larger than the sum of its proper divisors (1814153).

16535522551 is an equidigital number, since it uses as much as digits as its factorization.

16535522551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814152.

The product of its digits is 225000, while the sum is 40.

The spelling of 16535522551 in words is "sixteen billion, five hundred thirty-five million, five hundred twenty-two thousand, five hundred fifty-one".