769208661 has 12 divisors (see below), whose sum is σ = 1196546988. Its totient is φ = 473359104.

The previous prime is 769208633. The next prime is 769208677. The reversal of 769208661 is 166802967.

It can be written as a sum of positive squares in 2 ways, for example, as 437604561 + 331604100 = 20919^2 + 18210^2 .

It is not a de Polignac number, because 769208661 - 2⁹ = 769208149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769208621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3287100 + ... + 3287333.

It is an arithmetic number, because the mean of its divisors is an integer number (99712249).

Almost surely, 2^769208661 is an apocalyptic number.

It is an amenable number.

769208661 is a deficient number, since it is larger than the sum of its proper divisors (427338327).

769208661 is a wasteful number, since it uses less digits than its factorization.

769208661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574452 (or 6574449 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 769208661 is about 27734.6112465994. The cubic root of 769208661 is about 916.2515490024.

The spelling of 769208661 in words is "seven hundred sixty-nine million, two hundred eight thousand, six hundred sixty-one".