16531322779 has 2 divisors, whose sum is σ = 16531322780. Its totient is φ = 16531322778.

The previous prime is 16531322659. The next prime is 16531322783. The reversal of 16531322779 is 97722313561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16531322779 - 2⁷ = 16531322651 is a prime.

It is not a weakly prime, because it can be changed into another prime (16561322779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8265661389 + 8265661390.

It is an arithmetic number, because the mean of its divisors is an integer number (8265661390).

Almost surely, 2^16531322779 is an apocalyptic number.

16531322779 is a deficient number, since it is larger than the sum of its proper divisors (1).

16531322779 is an equidigital number, since it uses as much as digits as its factorization.

16531322779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The spelling of 16531322779 in words is "sixteen billion, five hundred thirty-one million, three hundred twenty-two thousand, seven hundred seventy-nine".