12561779303 has 2 divisors, whose sum is σ = 12561779304. Its totient is φ = 12561779302.

The previous prime is 12561779273. The next prime is 12561779309. The reversal of 12561779303 is 30397716521.

It is a strong prime.

It is an emirp because it is prime and its reverse (30397716521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12561779303 - 2¹⁴ = 12561762919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12561779309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6280889651 + 6280889652.

It is an arithmetic number, because the mean of its divisors is an integer number (6280889652).

Almost surely, 2^12561779303 is an apocalyptic number.

12561779303 is a deficient number, since it is larger than the sum of its proper divisors (1).

12561779303 is an equidigital number, since it uses as much as digits as its factorization.

12561779303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 44.

The spelling of 12561779303 in words is "twelve billion, five hundred sixty-one million, seven hundred seventy-nine thousand, three hundred three".