9661623849 has 6 divisors (see below), whose sum is σ = 13955678906. Its totient is φ = 6441082560.

The previous prime is 9661623841. The next prime is 9661623857. The reversal of 9661623849 is 9483261669.

9661623849 is a `hidden beast` number, since 9 + 6 + 6 + 1 + 623 + 8 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (9661623841) and next prime (9661623857).

It can be written as a sum of positive squares in only one way, i.e., 6018656400 + 3642967449 = 77580^2 + 60357^2 .

It is not a de Polignac number, because 9661623849 - 2³ = 9661623841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9661623795 and 9661623804.

It is not an unprimeable number, because it can be changed into a prime (9661623841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 536756872 + ... + 536756889.

Almost surely, 2^9661623849 is an apocalyptic number.

It is an amenable number.

9661623849 is a deficient number, since it is larger than the sum of its proper divisors (4294055057).

9661623849 is a wasteful number, since it uses less digits than its factorization.

9661623849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073513767 (or 1073513764 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The square root of 9661623849 is about 98293.5595499522. The cubic root of 9661623849 is about 2129.8550195574.

The spelling of 9661623849 in words is "nine billion, six hundred sixty-one million, six hundred twenty-three thousand, eight hundred forty-nine".