77800221000778 has 8 divisors (see below), whose sum is σ = 116782341576768. Its totient is φ = 38872773808524.

The previous prime is 77800221000673. The next prime is 77800221000779. The reversal of 77800221000778 is 87700012200877.

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

It is not an unprimeable number, because it can be changed into a prime (77800221000779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13668342376 + ... + 13668348067.

It is an arithmetic number, because the mean of its divisors is an integer number (14597792697096).

Almost surely, 2^{77800221000778} is an apocalyptic number.

77800221000778 is a deficient number, since it is larger than the sum of its proper divisors (38982120575990).

77800221000778 is a wasteful number, since it uses less digits than its factorization.

77800221000778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27336691868.

The product of its (nonzero) digits is 614656, while the sum is 49.

The spelling of 77800221000778 in words is "seventy-seven trillion, eight hundred billion, two hundred twenty-one million, seven hundred seventy-eight", and thus it is an aban number.