766500021 has 12 divisors (see below), whose sum is σ = 1265333472. Its totient is φ = 437999976.

The previous prime is 766499969. The next prime is 766500037. The reversal of 766500021 is 120005667.

766500021 is a `hidden beast` number, since 7 + 6 + 650 + 0 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 766500021 - 2¹¹ = 766497973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766500521) 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, 6083271 + ... + 6083396.

It is an arithmetic number, because the mean of its divisors is an integer number (105444456).

Almost surely, 2^766500021 is an apocalyptic number.

It is an amenable number.

766500021 is a deficient number, since it is larger than the sum of its proper divisors (498833451).

766500021 is a wasteful number, since it uses less digits than its factorization.

766500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12166680 (or 12166677 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 766500021 is about 27685.7367790709. The cubic root of 766500021 is about 915.1748084895.

Adding to 766500021 its reverse (120005667), we get a palindrome (886505688).

The spelling of 766500021 in words is "seven hundred sixty-six million, five hundred thousand, twenty-one".