77166180780 has 72 divisors (see below), whose sum is σ = 233964238032. Its totient is φ = 18994749696.

The previous prime is 77166180779. The next prime is 77166180781. The reversal of 77166180780 is 8708166177.

It is an interprime number because it is at equal distance from previous prime (77166180779) and next prime (77166180781).

It is not an unprimeable number, because it can be changed into a prime (77166180781) 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 23 ways as a sum of consecutive naturals, for example, 3794899 + ... + 3815178.

It is an arithmetic number, because the mean of its divisors is an integer number (3249503306).

Almost surely, 2^77166180780 is an apocalyptic number.

It is an amenable number.

77166180780 is an abundant number, since it is smaller than the sum of its proper divisors (156798057252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77166180780 is a wasteful number, since it uses less digits than its factorization.

77166180780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610115 (or 7610100 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 51.

The spelling of 77166180780 in words is "seventy-seven billion, one hundred sixty-six million, one hundred eighty thousand, seven hundred eighty".