12451989797 has 12 divisors (see below), whose sum is σ = 13508538084. Its totient is φ = 11472814080.

The previous prime is 12451989773. The next prime is 12451989799. The reversal of 12451989797 is 79798915421.

It can be written as a sum of positive squares in 6 ways, for example, as 5530748161 + 6921241636 = 74369^2 + 83194^2 .

It is not a de Polignac number, because 12451989797 - 2¹² = 12451985701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12451989799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23333 + ... + 159525.

It is an arithmetic number, because the mean of its divisors is an integer number (1125711507).

Almost surely, 2^12451989797 is an apocalyptic number.

It is an amenable number.

12451989797 is a deficient number, since it is larger than the sum of its proper divisors (1056548287).

12451989797 is a wasteful number, since it uses less digits than its factorization.

12451989797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136760 (or 136747 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 62.

The spelling of 12451989797 in words is "twelve billion, four hundred fifty-one million, nine hundred eighty-nine thousand, seven hundred ninety-seven".