9777361997 has 24 divisors (see below), whose sum is σ = 11231683560. Its totient is φ = 8478013440.

The previous prime is 9777361969. The next prime is 9777362011. The reversal of 9777361997 is 7991637779.

It can be written as a sum of positive squares in 12 ways, for example, as 7994326921 + 1783035076 = 89411^2 + 42226^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9777361997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9777361907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1631747 + ... + 1637727.

It is an arithmetic number, because the mean of its divisors is an integer number (467986815).

Almost surely, 2^9777361997 is an apocalyptic number.

It is an amenable number.

9777361997 is a deficient number, since it is larger than the sum of its proper divisors (1454321563).

9777361997 is a wasteful number, since it uses less digits than its factorization.

9777361997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593 (or 6580 counting only the distinct ones).

The product of its digits is 31505922, while the sum is 65.

The square root of 9777361997 is about 98880.5440771844. The cubic root of 9777361997 is about 2138.3259097694.

The spelling of 9777361997 in words is "nine billion, seven hundred seventy-seven million, three hundred sixty-one thousand, nine hundred ninety-seven".