16371779491 has 2 divisors, whose sum is σ = 16371779492. Its totient is φ = 16371779490.

The previous prime is 16371779471. The next prime is 16371779503. The reversal of 16371779491 is 19497717361.

It is a strong prime.

It is an emirp because it is prime and its reverse (19497717361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16371779491 - 2¹⁵ = 16371746723 is a prime.

It is not a weakly prime, because it can be changed into another prime (16371779471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8185889745 + 8185889746.

It is an arithmetic number, because the mean of its divisors is an integer number (8185889746).

Almost surely, 2^16371779491 is an apocalyptic number.

16371779491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16371779491 is an equidigital number, since it uses as much as digits as its factorization.

16371779491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 55.

The spelling of 16371779491 in words is "sixteen billion, three hundred seventy-one million, seven hundred seventy-nine thousand, four hundred ninety-one".