77766166683817 has 8 divisors (see below), whose sum is σ = 77903440972200. Its totient is φ = 77628894511104.

The previous prime is 77766166683809. The next prime is 77766166683823. The reversal of 77766166683817 is 71838666166777.

It can be written as a sum of positive squares in 4 ways, for example, as 3610972865536 + 74155193818281 = 1900256^2 + 8611341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77766166683817 - 2³ = 77766166683809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77766166683827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85334313 + ... + 86240809.

It is an arithmetic number, because the mean of its divisors is an integer number (9737930121525).

Almost surely, 2^{77766166683817} is an apocalyptic number.

It is an amenable number.

77766166683817 is a deficient number, since it is larger than the sum of its proper divisors (137274288383).

77766166683817 is a wasteful number, since it uses less digits than its factorization.

77766166683817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057835.

The product of its digits is 3584673792, while the sum is 79.

The spelling of 77766166683817 in words is "seventy-seven trillion, seven hundred sixty-six billion, one hundred sixty-six million, six hundred eighty-three thousand, eight hundred seventeen".