779969561 has 8 divisors (see below), whose sum is σ = 912124224. Its totient is φ = 652997520.

The previous prime is 779969539. The next prime is 779969599. The reversal of 779969561 is 165969977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 779969561 - 2⁶ = 779969497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 779969561.

It is not an unprimeable number, because it can be changed into a prime (779969501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1295330 + ... + 1295931.

It is an arithmetic number, because the mean of its divisors is an integer number (114015528).

Almost surely, 2^779969561 is an apocalyptic number.

It is an amenable number.

779969561 is a deficient number, since it is larger than the sum of its proper divisors (132154663).

779969561 is a wasteful number, since it uses less digits than its factorization.

779969561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591311.

The product of its digits is 6429780, while the sum is 59.

The square root of 779969561 is about 27927.9351367050. The cubic root of 779969561 is about 920.5044339082.

The spelling of 779969561 in words is "seven hundred seventy-nine million, nine hundred sixty-nine thousand, five hundred sixty-one".