779909966 has 16 divisors (see below), whose sum is σ = 1317385728. Its totient is φ = 343068600.

The previous prime is 779909959. The next prime is 779909987. The reversal of 779909966 is 669909977.

It is a super-2 number, since 2×779909966² = 1216519110132242312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a junction number, because it is equal to n+sod(n) for n = 779909899 and 779909908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571100 + ... + 572463.

It is an arithmetic number, because the mean of its divisors is an integer number (82336608).

Almost surely, 2^779909966 is an apocalyptic number.

779909966 is a deficient number, since it is larger than the sum of its proper divisors (537475762).

779909966 is a wasteful number, since it uses less digits than its factorization.

779909966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143607.

The product of its (nonzero) digits is 11573604, while the sum is 62.

The square root of 779909966 is about 27926.8681738572. The cubic root of 779909966 is about 920.4809890365.

The spelling of 779909966 in words is "seven hundred seventy-nine million, nine hundred nine thousand, nine hundred sixty-six".