766347806893 has 18 divisors (see below), whose sum is σ = 798695420558. Its totient is φ = 734771121840.

The previous prime is 766347806839. The next prime is 766347806909. The reversal of 766347806893 is 398608743667.

It can be written as a sum of positive squares in only one way, i.e., 745635704004 + 20712102889 = 863502^2 + 143917^2 .

It is not a de Polignac number, because 766347806893 - 2³⁷ = 628908853421 is a prime.

It is a super-2 number, since 2×766347806893² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766347806813) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 378068946 + ... + 378070972.

Almost surely, 2^766347806893 is an apocalyptic number.

It is an amenable number.

766347806893 is a deficient number, since it is larger than the sum of its proper divisors (32347613665).

766347806893 is an frugal number, since it uses more digits than its factorization.

766347806893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233 (or 2135 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 67.

The spelling of 766347806893 in words is "seven hundred sixty-six billion, three hundred forty-seven million, eight hundred six thousand, eight hundred ninety-three".