766276661 has 4 divisors (see below), whose sum is σ = 770865312. Its totient is φ = 761688012.

The previous prime is 766276627. The next prime is 766276663. The reversal of 766276661 is 166672667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 766276661 - 2¹⁰ = 766275637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766276663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294075 + ... + 2294408.

It is an arithmetic number, because the mean of its divisors is an integer number (192716328).

Almost surely, 2^766276661 is an apocalyptic number.

It is an amenable number.

766276661 is a deficient number, since it is larger than the sum of its proper divisors (4588651).

766276661 is a wasteful number, since it uses less digits than its factorization.

766276661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588650.

The product of its digits is 762048, while the sum is 47.

The square root of 766276661 is about 27681.7026391080. The cubic root of 766276661 is about 915.0859051199.

The spelling of 766276661 in words is "seven hundred sixty-six million, two hundred seventy-six thousand, six hundred sixty-one".