766665090766 has 4 divisors (see below), whose sum is σ = 1149997636152. Its totient is φ = 383332545382.

The previous prime is 766665090757. The next prime is 766665090787. The reversal of 766665090766 is 667090566667.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×766665090766² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 766665090698 and 766665090707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191666272690 + ... + 191666272693.

It is an arithmetic number, because the mean of its divisors is an integer number (287499409038).

Almost surely, 2^766665090766 is an apocalyptic number.

766665090766 is a deficient number, since it is larger than the sum of its proper divisors (383332545386).

766665090766 is a wasteful number, since it uses less digits than its factorization.

766665090766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383332545385.

The product of its (nonzero) digits is 102876480, while the sum is 64.

The spelling of 766665090766 in words is "seven hundred sixty-six billion, six hundred sixty-five million, ninety thousand, seven hundred sixty-six".