766968561 has 16 divisors (see below), whose sum is σ = 1137955200. Its totient is φ = 510544944.

The previous prime is 766968547. The next prime is 766968569. The reversal of 766968561 is 165869667.

766968561 is a `hidden beast` number, since 76 + 6 + 9 + 6 + 8 + 561 = 666.

It is not a de Polignac number, because 766968561 - 2¹¹ = 766966513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766968498 and 766968507.

It is not an unprimeable number, because it can be changed into a prime (766968569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2701 + ... + 39258.

It is an arithmetic number, because the mean of its divisors is an integer number (71122200).

Almost surely, 2^766968561 is an apocalyptic number.

It is an amenable number.

766968561 is a deficient number, since it is larger than the sum of its proper divisors (370986639).

766968561 is a wasteful number, since it uses less digits than its factorization.

766968561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42645 (or 42639 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 766968561 is about 27694.1972441882. The cubic root of 766968561 is about 915.3612440852.

The spelling of 766968561 in words is "seven hundred sixty-six million, nine hundred sixty-eight thousand, five hundred sixty-one".