9966924591 has 16 divisors (see below), whose sum is σ = 14342823264. Its totient is φ = 6120059904.

The previous prime is 9966924589. The next prime is 9966924761. The reversal of 9966924591 is 1954296699.

It is not a de Polignac number, because 9966924591 - 2¹ = 9966924589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966924551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261786 + ... + 297431.

It is an arithmetic number, because the mean of its divisors is an integer number (896426454).

Almost surely, 2^9966924591 is an apocalyptic number.

9966924591 is a deficient number, since it is larger than the sum of its proper divisors (4375898673).

9966924591 is a wasteful number, since it uses less digits than its factorization.

9966924591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559690.

The product of its digits is 9447840, while the sum is 60.

The square root of 9966924591 is about 99834.4859805468. The cubic root of 9966924591 is about 2152.0567727977.

The spelling of 9966924591 in words is "nine billion, nine hundred sixty-six million, nine hundred twenty-four thousand, five hundred ninety-one".