1990663573 has 8 divisors (see below), whose sum is σ = 2096932320. Its totient is φ = 1884544560.

The previous prime is 1990663541. The next prime is 1990663589. The reversal of 1990663573 is 3753660991.

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

It is a cyclic number.

It is not a de Polignac number, because 1990663573 - 2⁵ = 1990663541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990663513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9598 + ... + 63823.

It is an arithmetic number, because the mean of its divisors is an integer number (262116540).

Almost surely, 2^1990663573 is an apocalyptic number.

It is an amenable number.

1990663573 is a deficient number, since it is larger than the sum of its proper divisors (106268747).

1990663573 is a wasteful number, since it uses less digits than its factorization.

1990663573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74867.

The product of its (nonzero) digits is 918540, while the sum is 49.

The square root of 1990663573 is about 44616.8530154246. The cubic root of 1990663573 is about 1257.9574644210.

The spelling of 1990663573 in words is "one billion, nine hundred ninety million, six hundred sixty-three thousand, five hundred seventy-three".