9925655591 has 2 divisors, whose sum is σ = 9925655592. Its totient is φ = 9925655590.

The previous prime is 9925655587. The next prime is 9925655599. The reversal of 9925655591 is 1955565299.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9925655591 - 2² = 9925655587 is a prime.

It is a super-2 number, since 2×9925655591² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9925655599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4962827795 + 4962827796.

It is an arithmetic number, because the mean of its divisors is an integer number (4962827796).

Almost surely, 2^9925655591 is an apocalyptic number.

9925655591 is a deficient number, since it is larger than the sum of its proper divisors (1).

9925655591 is an equidigital number, since it uses as much as digits as its factorization.

9925655591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5467500, while the sum is 56.

The square root of 9925655591 is about 99627.5844884337. The cubic root of 9925655591 is about 2149.0823984799.

The spelling of 9925655591 in words is "nine billion, nine hundred twenty-five million, six hundred fifty-five thousand, five hundred ninety-one".