9777691660 has 24 divisors (see below), whose sum is σ = 22399803216. Its totient is φ = 3555524160.

The previous prime is 9777691597. The next prime is 9777691663. The reversal of 9777691660 is 661967779.

It is a junction number, because it is equal to n+sod(n) for n = 9777691595 and 9777691604.

It is not an unprimeable number, because it can be changed into a prime (9777691663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22221807 + ... + 22222246.

It is an arithmetic number, because the mean of its divisors is an integer number (933325134).

Almost surely, 2^9777691660 is an apocalyptic number.

It is an amenable number.

9777691660 is an abundant number, since it is smaller than the sum of its proper divisors (12622111556).

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

9777691660 is a wasteful number, since it uses less digits than its factorization.

9777691660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44444073 (or 44444071 counting only the distinct ones).

The product of its (nonzero) digits is 6001128, while the sum is 58.

The square root of 9777691660 is about 98882.2110391955. The cubic root of 9777691660 is about 2138.3499421213.

The spelling of 9777691660 in words is "nine billion, seven hundred seventy-seven million, six hundred ninety-one thousand, six hundred sixty".