12694728951 has 24 divisors (see below), whose sum is σ = 20141147520. Its totient is φ = 7669124496.

The previous prime is 12694728931. The next prime is 12694728973. The reversal of 12694728951 is 15982749621.

It is a happy number.

It is not a de Polignac number, because 12694728951 - 2²¹ = 12692631799 is a prime.

It is a super-2 number, since 2×12694728951² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12694728931) 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 23 ways as a sum of consecutive naturals, for example, 1609941 + ... + 1617806.

It is an arithmetic number, because the mean of its divisors is an integer number (839214480).

Almost surely, 2^12694728951 is an apocalyptic number.

12694728951 is a deficient number, since it is larger than the sum of its proper divisors (7446418569).

12694728951 is a wasteful number, since it uses less digits than its factorization.

12694728951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227795 (or 3227792 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 12694728951 in words is "twelve billion, six hundred ninety-four million, seven hundred twenty-eight thousand, nine hundred fifty-one".