9660025891 has 2 divisors, whose sum is σ = 9660025892. Its totient is φ = 9660025890.

The previous prime is 9660025811. The next prime is 9660025901. The reversal of 9660025891 is 1985200669.

It is a strong prime.

It is an emirp because it is prime and its reverse (1985200669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9660025891 - 2¹¹ = 9660023843 is a prime.

It is a super-2 number, since 2×9660025891² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9660025801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830012945 + 4830012946.

It is an arithmetic number, because the mean of its divisors is an integer number (4830012946).

Almost surely, 2^9660025891 is an apocalyptic number.

9660025891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9660025891 is an equidigital number, since it uses as much as digits as its factorization.

9660025891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 9660025891 is about 98285.4307158492. The cubic root of 9660025891 is about 2129.7375925571.

The spelling of 9660025891 in words is "nine billion, six hundred sixty million, twenty-five thousand, eight hundred ninety-one".