77860885621717 has 4 divisors (see below), whose sum is σ = 84939147950976. Its totient is φ = 70782623292460.

The previous prime is 77860885621697. The next prime is 77860885621721. The reversal of 77860885621717 is 71712658806877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77860885621717 - 2³⁵ = 77826525883349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77860885621717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77860885621117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3539131164613 + ... + 3539131164634.

It is an arithmetic number, because the mean of its divisors is an integer number (21234786987744).

Almost surely, 2^{77860885621717} is an apocalyptic number.

It is an amenable number.

77860885621717 is a deficient number, since it is larger than the sum of its proper divisors (7078262329259).

77860885621717 is a wasteful number, since it uses less digits than its factorization.

77860885621717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7078262329258.

The product of its (nonzero) digits is 442552320, while the sum is 73.

The spelling of 77860885621717 in words is "seventy-seven trillion, eight hundred sixty billion, eight hundred eighty-five million, six hundred twenty-one thousand, seven hundred seventeen".