77766166683416 has 8 divisors (see below), whose sum is σ = 145811562531420. Its totient is φ = 38883083341704.

The previous prime is 77766166683349. The next prime is 77766166683419. The reversal of 77766166683416 is 61438666166777.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77766166683419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860385417706 + ... + 4860385417721.

Almost surely, 2^{77766166683416} is an apocalyptic number.

It is an amenable number.

77766166683416 is a deficient number, since it is larger than the sum of its proper divisors (68045395848004).

77766166683416 is a wasteful number, since it uses less digits than its factorization.

77766166683416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720770835433 (or 9720770835429 counting only the distinct ones).

The product of its digits is 1536288768, while the sum is 74.

The spelling of 77766166683416 in words is "seventy-seven trillion, seven hundred sixty-six billion, one hundred sixty-six million, six hundred eighty-three thousand, four hundred sixteen".