12500081851 has 4 divisors (see below), whose sum is σ = 12500372304. Its totient is φ = 12499791400.

The previous prime is 12500081821. The next prime is 12500081879. The reversal of 12500081851 is 15818000521.

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 12500081851 - 2⁵ = 12500081819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12500081821) 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, 66415 + ... + 171496.

It is an arithmetic number, because the mean of its divisors is an integer number (3125093076).

Almost surely, 2^12500081851 is an apocalyptic number.

12500081851 is a deficient number, since it is larger than the sum of its proper divisors (290453).

12500081851 is an equidigital number, since it uses as much as digits as its factorization.

12500081851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290452.

The product of its (nonzero) digits is 3200, while the sum is 31.

The spelling of 12500081851 in words is "twelve billion, five hundred million, eighty-one thousand, eight hundred fifty-one".