15091779779 has 2 divisors, whose sum is σ = 15091779780. Its totient is φ = 15091779778.

The previous prime is 15091779737. The next prime is 15091779793. The reversal of 15091779779 is 97797719051.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15091779779 - 2¹² = 15091775683 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15091779709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7545889889 + 7545889890.

It is an arithmetic number, because the mean of its divisors is an integer number (7545889890).

Almost surely, 2^15091779779 is an apocalyptic number.

15091779779 is a deficient number, since it is larger than the sum of its proper divisors (1).

15091779779 is an equidigital number, since it uses as much as digits as its factorization.

15091779779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8751645, while the sum is 62.

The spelling of 15091779779 in words is "fifteen billion, ninety-one million, seven hundred seventy-nine thousand, seven hundred seventy-nine".