661166358 has 8 divisors (see below), whose sum is σ = 1322332728. Its totient is φ = 220388784.

The previous prime is 661166353. The next prime is 661166377. The reversal of 661166358 is 853661166.

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

661166358 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661166353) 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, 55097191 + ... + 55097202.

It is an arithmetic number, because the mean of its divisors is an integer number (165291591).

Almost surely, 2^661166358 is an apocalyptic number.

661166358 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661166358 is a wasteful number, since it uses less digits than its factorization.

661166358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110194398.

The product of its digits is 155520, while the sum is 42.

The square root of 661166358 is about 25713.1553489649. The cubic root of 661166358 is about 871.1713459896.

The spelling of 661166358 in words is "six hundred sixty-one million, one hundred sixty-six thousand, three hundred fifty-eight".