766140236681 has 2 divisors, whose sum is σ = 766140236682. Its totient is φ = 766140236680.

The previous prime is 766140236629. The next prime is 766140236777. The reversal of 766140236681 is 186632041667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733234276681 + 32905960000 = 856291^2 + 181400^2 .

It is an emirp because it is prime and its reverse (186632041667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 766140236681 - 2²² = 766136042377 is a prime.

It is a super-2 number, since 2×766140236681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (766140236581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383070118340 + 383070118341.

It is an arithmetic number, because the mean of its divisors is an integer number (383070118341).

Almost surely, 2^766140236681 is an apocalyptic number.

It is an amenable number.

766140236681 is a deficient number, since it is larger than the sum of its proper divisors (1).

766140236681 is an equidigital number, since it uses as much as digits as its factorization.

766140236681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 766140236681 in words is "seven hundred sixty-six billion, one hundred forty million, two hundred thirty-six thousand, six hundred eighty-one".