766316991 has 8 divisors (see below), whose sum is σ = 1114642944. Its totient is φ = 464434520.

The previous prime is 766316981. The next prime is 766317001. The reversal of 766316991 is 199613667.

It is an interprime number because it is at equal distance from previous prime (766316981) and next prime (766317001).

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

It is not a de Polignac number, because 766316991 - 2⁹ = 766316479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 766316991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766316951) 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, 11610831 + ... + 11610896.

It is an arithmetic number, because the mean of its divisors is an integer number (139330368).

Almost surely, 2^766316991 is an apocalyptic number.

766316991 is a deficient number, since it is larger than the sum of its proper divisors (348325953).

766316991 is a wasteful number, since it uses less digits than its factorization.

766316991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23221741.

The product of its digits is 367416, while the sum is 48.

The square root of 766316991 is about 27682.4310890500. The cubic root of 766316991 is about 915.1019588374.

The spelling of 766316991 in words is "seven hundred sixty-six million, three hundred sixteen thousand, nine hundred ninety-one".