16551966979 has 2 divisors, whose sum is σ = 16551966980. Its totient is φ = 16551966978.

The previous prime is 16551966947. The next prime is 16551967039. The reversal of 16551966979 is 97966915561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16551966979 - 2⁵ = 16551966947 is a prime.

It is a super-2 number, since 2×16551966979² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16551966979.

It is not a weakly prime, because it can be changed into another prime (16551967979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275983489 + 8275983490.

It is an arithmetic number, because the mean of its divisors is an integer number (8275983490).

Almost surely, 2^16551966979 is an apocalyptic number.

16551966979 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551966979 is an equidigital number, since it uses as much as digits as its factorization.

16551966979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27556200, while the sum is 64.

The spelling of 16551966979 in words is "sixteen billion, five hundred fifty-one million, nine hundred sixty-six thousand, nine hundred seventy-nine".