16979776091 has 2 divisors, whose sum is σ = 16979776092. Its totient is φ = 16979776090.

The previous prime is 16979776087. The next prime is 16979776111. The reversal of 16979776091 is 19067797961.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19067797961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16979776091 - 2² = 16979776087 is a prime.

It is a super-2 number, since 2×16979776091² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16979776081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8489888045 + 8489888046.

It is an arithmetic number, because the mean of its divisors is an integer number (8489888046).

Almost surely, 2^16979776091 is an apocalyptic number.

16979776091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16979776091 is an equidigital number, since it uses as much as digits as its factorization.

16979776091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9001692, while the sum is 62.

The spelling of 16979776091 in words is "sixteen billion, nine hundred seventy-nine million, seven hundred seventy-six thousand, ninety-one".