77666851072 has 72 divisors (see below), whose sum is σ = 157054010400. Its totient is φ = 38328102912.

The previous prime is 77666851051. The next prime is 77666851109. The reversal of 77666851072 is 27015866677.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14100543 + ... + 14106049.

It is an arithmetic number, because the mean of its divisors is an integer number (2181305700).

Almost surely, 2^77666851072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77666851072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78527005200).

77666851072 is an abundant number, since it is smaller than the sum of its proper divisors (79387159328).

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

77666851072 is an equidigital number, since it uses as much as digits as its factorization.

77666851072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231 (or 6217 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 77666851072 in words is "seventy-seven billion, six hundred sixty-six million, eight hundred fifty-one thousand, seventy-two".