77571187216 has 80 divisors (see below), whose sum is σ = 162398355840. Its totient is φ = 35773885440.

The previous prime is 77571187193. The next prime is 77571187223. The reversal of 77571187216 is 61278117577.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6263206 + ... + 6275578.

It is an arithmetic number, because the mean of its divisors is an integer number (2029979448).

Almost surely, 2^77571187216 is an apocalyptic number.

77571187216 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77571187216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81199177920).

77571187216 is an abundant number, since it is smaller than the sum of its proper divisors (84827168624).

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

77571187216 is a wasteful number, since it uses less digits than its factorization.

77571187216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12944 (or 12938 counting only the distinct ones).

The product of its digits is 1152480, while the sum is 52.

The spelling of 77571187216 in words is "seventy-seven billion, five hundred seventy-one million, one hundred eighty-seven thousand, two hundred sixteen".