9747820669 has 4 divisors (see below), whose sum is σ = 9748039996. Its totient is φ = 9747601344.

The previous prime is 9747820651. The next prime is 9747820697. The reversal of 9747820669 is 9660287479.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3750092644 + 5997728025 = 61238^2 + 77445^2 .

It is a cyclic number.

It is not a de Polignac number, because 9747820669 - 2⁹ = 9747820157 is a prime.

It is a super-2 number, since 2×9747820669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9747820609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16764 + ... + 140629.

It is an arithmetic number, because the mean of its divisors is an integer number (2437009999).

Almost surely, 2^9747820669 is an apocalyptic number.

It is an amenable number.

9747820669 is a deficient number, since it is larger than the sum of its proper divisors (219327).

9747820669 is a wasteful number, since it uses less digits than its factorization.

9747820669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219326.

The product of its (nonzero) digits is 9144576, while the sum is 58.

The square root of 9747820669 is about 98731.0522024353. The cubic root of 9747820669 is about 2136.1701574066.

The spelling of 9747820669 in words is "nine billion, seven hundred forty-seven million, eight hundred twenty thousand, six hundred sixty-nine".