9991601764 has 81 divisors (see below), whose sum is σ = 19095445579. Its totient is φ = 4574078080.

The previous prime is 9991601759. The next prime is 9991601771. The reversal of 9991601764 is 4671061999.

The square root of 9991601764 is 99958.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1081752100 + 8909849664 = 32890^2 + 94392^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 188520762 + ... + 188520814.

Almost surely, 2^9991601764 is an apocalyptic number.

9991601764 is the 99958-th square number.

It is an amenable number.

9991601764 is a deficient number, since it is larger than the sum of its proper divisors (9103843815).

9991601764 is a wasteful number, since it uses less digits than its factorization.

9991601764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The cubic root of 9991601764 is about 2153.8314060839.

The spelling of 9991601764 in words is "nine billion, nine hundred ninety-one million, six hundred one thousand, seven hundred sixty-four".