12291765557 has 2 divisors, whose sum is σ = 12291765558. Its totient is φ = 12291765556.

The previous prime is 12291765517. The next prime is 12291765583. The reversal of 12291765557 is 75556719221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11227309681 + 1064455876 = 105959^2 + 32626^2 .

It is a cyclic number.

It is not a de Polignac number, because 12291765557 - 2²⁰ = 12290716981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12291765517) 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 as a sum of consecutive naturals, namely, 6145882778 + 6145882779.

It is an arithmetic number, because the mean of its divisors is an integer number (6145882779).

Almost surely, 2^12291765557 is an apocalyptic number.

It is an amenable number.

12291765557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291765557 is an equidigital number, since it uses as much as digits as its factorization.

12291765557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 50.

The spelling of 12291765557 in words is "twelve billion, two hundred ninety-one million, seven hundred sixty-five thousand, five hundred fifty-seven".