661090583 has 8 divisors (see below), whose sum is σ = 689111280. Its totient is φ = 633418240.

The previous prime is 661090513. The next prime is 661090597. The reversal of 661090583 is 385090166.

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 661090583 - 2⁸ = 661090327 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 (661090513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83210 + ... + 90807.

It is an arithmetic number, because the mean of its divisors is an integer number (86138910).

Almost surely, 2^661090583 is an apocalyptic number.

661090583 is a deficient number, since it is larger than the sum of its proper divisors (28020697).

661090583 is a wasteful number, since it uses less digits than its factorization.

661090583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174177.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 661090583 is about 25711.6818391952. The cubic root of 661090583 is about 871.1380636293.

The spelling of 661090583 in words is "six hundred sixty-one million, ninety thousand, five hundred eighty-three".