15812221851 has 48 divisors (see below), whose sum is σ = 23511301632. Its totient is φ = 10237536000.

The previous prime is 15812221847. The next prime is 15812221897.

15812221851 is a `hidden beast` number, since 1 + 581 + 2 + 2 + 21 + 8 + 51 = 666.

15812221851 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15812221851 - 2² = 15812221847 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (15812221651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11617411 + ... + 11618771.

It is an arithmetic number, because the mean of its divisors is an integer number (489818784).

Almost surely, 2^15812221851 is an apocalyptic number.

15812221851 is a deficient number, since it is larger than the sum of its proper divisors (7699079781).

15812221851 is a wasteful number, since it uses less digits than its factorization.

15812221851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704 (or 1701 counting only the distinct ones).

The product of its digits is 12800, while the sum is 36.

The spelling of 15812221851 in words is "fifteen billion, eight hundred twelve million, two hundred twenty-one thousand, eight hundred fifty-one".