77800186788861 has 16 divisors (see below), whose sum is σ = 108692882305920. Its totient is φ = 49405855572480.

The previous prime is 77800186788859. The next prime is 77800186788941. The reversal of 77800186788861 is 16888768100877.

It is not a de Polignac number, because 77800186788861 - 2¹ = 77800186788859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77800186783861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2339275776 + ... + 2339309033.

It is an arithmetic number, because the mean of its divisors is an integer number (6793305144120).

Almost surely, 2^{77800186788861} is an apocalyptic number.

It is an amenable number.

77800186788861 is a deficient number, since it is larger than the sum of its proper divisors (30892695517059).

77800186788861 is a wasteful number, since it uses less digits than its factorization.

77800186788861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678585076.

The product of its (nonzero) digits is 404619264, while the sum is 75.

The spelling of 77800186788861 in words is "seventy-seven trillion, eight hundred billion, one hundred eighty-six million, seven hundred eighty-eight thousand, eight hundred sixty-one".