691768719976 has 8 divisors (see below), whose sum is σ = 1297066349970. Its totient is φ = 345884359984.

The previous prime is 691768719973. The next prime is 691768719977. The reversal of 691768719976 is 679917867196.

It can be written as a sum of positive squares in only one way, i.e., 524283157476 + 167485562500 = 724074^2 + 409250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (691768719973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43235544991 + ... + 43235545006.

Almost surely, 2^691768719976 is an apocalyptic number.

It is an amenable number.

691768719976 is a deficient number, since it is larger than the sum of its proper divisors (605297629994).

691768719976 is a wasteful number, since it uses less digits than its factorization.

691768719976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86471090003 (or 86471089999 counting only the distinct ones).

The product of its digits is 432081216, while the sum is 76.

The spelling of 691768719976 in words is "six hundred ninety-one billion, seven hundred sixty-eight million, seven hundred nineteen thousand, nine hundred seventy-six".