766691579221 has 8 divisors (see below), whose sum is σ = 797380229120. Its totient is φ = 736527521808.

The previous prime is 766691579207. The next prime is 766691579249. The reversal of 766691579221 is 122975196667.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 766691579221 - 2¹¹ = 766691577173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 766691579221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766691570221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131145141 + ... + 131150986.

It is an arithmetic number, because the mean of its divisors is an integer number (99672528640).

Almost surely, 2^766691579221 is an apocalyptic number.

It is an amenable number.

766691579221 is a deficient number, since it is larger than the sum of its proper divisors (30688649899).

766691579221 is a wasteful number, since it uses less digits than its factorization.

766691579221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262296243.

The product of its digits is 17146080, while the sum is 61.

The spelling of 766691579221 in words is "seven hundred sixty-six billion, six hundred ninety-one million, five hundred seventy-nine thousand, two hundred twenty-one".