12238863557 has 2 divisors, whose sum is σ = 12238863558. Its totient is φ = 12238863556.

The previous prime is 12238863541. The next prime is 12238863563. The reversal of 12238863557 is 75536883221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12181316161 + 57547396 = 110369^2 + 7586^2 .

It is a cyclic number.

It is not a de Polignac number, because 12238863557 - 2⁴ = 12238863541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12238863577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6119431778 + 6119431779.

It is an arithmetic number, because the mean of its divisors is an integer number (6119431779).

Almost surely, 2^12238863557 is an apocalyptic number.

It is an amenable number.

12238863557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12238863557 is an equidigital number, since it uses as much as digits as its factorization.

12238863557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 50.

The spelling of 12238863557 in words is "twelve billion, two hundred thirty-eight million, eight hundred sixty-three thousand, five hundred fifty-seven".