663725091 has 8 divisors (see below), whose sum is σ = 888117264. Its totient is φ = 440908160.

The previous prime is 663725087. The next prime is 663725123. The reversal of 663725091 is 190527366.

663725091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 663725091 - 2² = 663725087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663725071) 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, 392826 + ... + 394511.

It is an arithmetic number, because the mean of its divisors is an integer number (111014658).

Almost surely, 2^663725091 is an apocalyptic number.

663725091 is a deficient number, since it is larger than the sum of its proper divisors (224392173).

663725091 is a wasteful number, since it uses less digits than its factorization.

663725091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787621.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 663725091 is about 25762.8626320912. The cubic root of 663725091 is about 872.2937188273.

The spelling of 663725091 in words is "six hundred sixty-three million, seven hundred twenty-five thousand, ninety-one".