766534221 has 6 divisors (see below), whose sum is σ = 1107216110. Its totient is φ = 511022808.

The previous prime is 766534207. The next prime is 766534229. The reversal of 766534221 is 122435667.

It can be written as a sum of positive squares in only one way, i.e., 568822500 + 197711721 = 23850^2 + 14061^2 .

It is not a de Polignac number, because 766534221 - 2⁵ = 766534189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766534229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42585226 + ... + 42585243.

Almost surely, 2^766534221 is an apocalyptic number.

It is an amenable number.

766534221 is a deficient number, since it is larger than the sum of its proper divisors (340681889).

766534221 is a wasteful number, since it uses less digits than its factorization.

766534221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85170475 (or 85170472 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 766534221 is about 27686.3544187385. The cubic root of 766534221 is about 915.1884194972.

Adding to 766534221 its reverse (122435667), we get a palindrome (888969888).

The spelling of 766534221 in words is "seven hundred sixty-six million, five hundred thirty-four thousand, two hundred twenty-one".