990173517622 has 8 divisors (see below), whose sum is σ = 1506179435472. Its totient is φ = 488113705800.

The previous prime is 990173517589. The next prime is 990173517623. The reversal of 990173517622 is 226715371099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 990173517622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990173517623) 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, 3486526329 + ... + 3486526612.

It is an arithmetic number, because the mean of its divisors is an integer number (188272429434).

Almost surely, 2^990173517622 is an apocalyptic number.

990173517622 is a deficient number, since it is larger than the sum of its proper divisors (516005917850).

990173517622 is a wasteful number, since it uses less digits than its factorization.

990173517622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973053014.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The spelling of 990173517622 in words is "nine hundred ninety billion, one hundred seventy-three million, five hundred seventeen thousand, six hundred twenty-two".