766716406665 has 64 divisors (see below), whose sum is σ = 1375342329600. Its totient is φ = 361456266240.

The previous prime is 766716406663. The next prime is 766716406669. The reversal of 766716406665 is 566604617667.

It is a happy number.

It is not a de Polignac number, because 766716406665 - 2¹ = 766716406663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766716406599 and 766716406608.

It is not an unprimeable number, because it can be changed into a prime (766716406661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9416107 + ... + 9497183.

It is an arithmetic number, because the mean of its divisors is an integer number (21489723900).

Almost surely, 2^766716406665 is an apocalyptic number.

It is an amenable number.

766716406665 is a deficient number, since it is larger than the sum of its proper divisors (608625922935).

766716406665 is a wasteful number, since it uses less digits than its factorization.

766716406665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82682.

The product of its (nonzero) digits is 45722880, while the sum is 60.

The spelling of 766716406665 in words is "seven hundred sixty-six billion, seven hundred sixteen million, four hundred six thousand, six hundred sixty-five".