12499931805 has 16 divisors (see below), whose sum is σ = 20002054464. Its totient is φ = 6665909120.

The previous prime is 12499931803. The next prime is 12499931881. The reversal of 12499931805 is 50813999421.

It is not a de Polignac number, because 12499931805 - 2¹ = 12499931803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12499931803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117010 + ... + 196700.

It is an arithmetic number, because the mean of its divisors is an integer number (1250128404).

Almost surely, 2^12499931805 is an apocalyptic number.

12499931805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12499931805 is a deficient number, since it is larger than the sum of its proper divisors (7502122659).

12499931805 is a wasteful number, since it uses less digits than its factorization.

12499931805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90156.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 12499931805 in words is "twelve billion, four hundred ninety-nine million, nine hundred thirty-one thousand, eight hundred five".