12440436557 has 2 divisors, whose sum is σ = 12440436558. Its totient is φ = 12440436556.

The previous prime is 12440436529. The next prime is 12440436571. The reversal of 12440436557 is 75563404421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10777346596 + 1663089961 = 103814^2 + 40781^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440436557 - 2¹⁰ = 12440435533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440436517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220218278 + 6220218279.

It is an arithmetic number, because the mean of its divisors is an integer number (6220218279).

Almost surely, 2^12440436557 is an apocalyptic number.

It is an amenable number.

12440436557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440436557 is an equidigital number, since it uses as much as digits as its factorization.

12440436557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 12440436557 in words is "twelve billion, four hundred forty million, four hundred thirty-six thousand, five hundred fifty-seven".