661058189 has 8 divisors (see below), whose sum is σ = 723298368. Its totient is φ = 599175360.

The previous prime is 661058137. The next prime is 661058213. The reversal of 661058189 is 981850166.

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 661058189 - 2²⁸ = 392622733 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 (661058989) 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, 85457 + ... + 92870.

It is an arithmetic number, because the mean of its divisors is an integer number (90412296).

Almost surely, 2^661058189 is an apocalyptic number.

It is an amenable number.

661058189 is a deficient number, since it is larger than the sum of its proper divisors (62240179).

661058189 is a wasteful number, since it uses less digits than its factorization.

661058189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178675.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 661058189 is about 25711.0518843551. The cubic root of 661058189 is about 871.1238345620.

The spelling of 661058189 in words is "six hundred sixty-one million, fifty-eight thousand, one hundred eighty-nine".