77786566221244 has 12 divisors (see below), whose sum is σ = 136126567309600. Its totient is φ = 38893261275648.

The previous prime is 77786566221227. The next prime is 77786566221281. The reversal of 77786566221244 is 44212266568777.

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 77786566221244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4627597 + ... + 13303675.

Almost surely, 2^{77786566221244} is an apocalyptic number.

It is an amenable number.

77786566221244 is a deficient number, since it is larger than the sum of its proper divisors (58340001088356).

77786566221244 is a wasteful number, since it uses less digits than its factorization.

77786566221244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917492 (or 10917490 counting only the distinct ones).

The product of its digits is 379330560, while the sum is 67.

The spelling of 77786566221244 in words is "seventy-seven trillion, seven hundred eighty-six billion, five hundred sixty-six million, two hundred twenty-one thousand, two hundred forty-four".