77386650660 has 144 divisors (see below), whose sum is σ = 257054878080. Its totient is φ = 18688942080.

The previous prime is 77386650643. The next prime is 77386650667. The reversal of 77386650660 is 6605668377.

77386650660 is a `hidden beast` number, since 7 + 73 + 8 + 6 + 6 + 506 + 60 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 77386650597 and 77386650606.

It is not an unprimeable number, because it can be changed into a prime (77386650667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 446436 + ... + 595044.

It is an arithmetic number, because the mean of its divisors is an integer number (1785103320).

Almost surely, 2^77386650660 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 77386650660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128527439040).

77386650660 is an abundant number, since it is smaller than the sum of its proper divisors (179668227420).

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

77386650660 is a wasteful number, since it uses less digits than its factorization.

77386650660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148898 (or 148893 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 77386650660 in words is "seventy-seven billion, three hundred eighty-six million, six hundred fifty thousand, six hundred sixty".