9666374491 has 2 divisors, whose sum is σ = 9666374492. Its totient is φ = 9666374490.

The previous prime is 9666374401. The next prime is 9666374551. The reversal of 9666374491 is 1944736669.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9666374491 - 2²¹ = 9664277339 is a prime.

It is not a weakly prime, because it can be changed into another prime (9666374401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833187245 + 4833187246.

It is an arithmetic number, because the mean of its divisors is an integer number (4833187246).

Almost surely, 2^9666374491 is an apocalyptic number.

9666374491 is a deficient number, since it is larger than the sum of its proper divisors (1).

9666374491 is an equidigital number, since it uses as much as digits as its factorization.

9666374491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 55.

The square root of 9666374491 is about 98317.7221613682. The cubic root of 9666374491 is about 2130.2040471792.

The spelling of 9666374491 in words is "nine billion, six hundred sixty-six million, three hundred seventy-four thousand, four hundred ninety-one".