12398778937 has 2 divisors, whose sum is σ = 12398778938. Its totient is φ = 12398778936.

The previous prime is 12398778913. The next prime is 12398778949. The reversal of 12398778937 is 73987789321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12360102976 + 38675961 = 111176^2 + 6219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12398778937 is a prime.

It is not a weakly prime, because it can be changed into another prime (12398778137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6199389468 + 6199389469.

It is an arithmetic number, because the mean of its divisors is an integer number (6199389469).

Almost surely, 2^12398778937 is an apocalyptic number.

It is an amenable number.

12398778937 is a deficient number, since it is larger than the sum of its proper divisors (1).

12398778937 is an equidigital number, since it uses as much as digits as its factorization.

12398778937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 64.

The spelling of 12398778937 in words is "twelve billion, three hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred thirty-seven".