990717940171 has 4 divisors (see below), whose sum is σ = 1013757892312. Its totient is φ = 967677988032.

The previous prime is 990717940057. The next prime is 990717940187. The reversal of 990717940171 is 171049717099.

It is a happy number.

990717940171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 990717940171 - 2¹³ = 990717931979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990717940571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11519976006 + ... + 11519976091.

It is an arithmetic number, because the mean of its divisors is an integer number (253439473078).

Almost surely, 2^990717940171 is an apocalyptic number.

990717940171 is a deficient number, since it is larger than the sum of its proper divisors (23039952141).

990717940171 is a wasteful number, since it uses less digits than its factorization.

990717940171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23039952140.

The product of its (nonzero) digits is 1000188, while the sum is 55.

The spelling of 990717940171 in words is "nine hundred ninety billion, seven hundred seventeen million, nine hundred forty thousand, one hundred seventy-one".