15545516851 has 4 divisors (see below), whose sum is σ = 16221408912. Its totient is φ = 14869624792.

The previous prime is 15545516807. The next prime is 15545516869. The reversal of 15545516851 is 15861554551.

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 15545516851 - 2¹⁵ = 15545484083 is a prime.

It is a super-3 number, since 3×15545516851³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15545516251) 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, 337945996 + ... + 337946041.

It is an arithmetic number, because the mean of its divisors is an integer number (4055352228).

Almost surely, 2^15545516851 is an apocalyptic number.

15545516851 is a deficient number, since it is larger than the sum of its proper divisors (675892061).

15545516851 is an equidigital number, since it uses as much as digits as its factorization.

15545516851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675892060.

The product of its digits is 600000, while the sum is 46.

The spelling of 15545516851 in words is "fifteen billion, five hundred forty-five million, five hundred sixteen thousand, eight hundred fifty-one".