661846823 has 8 divisors (see below), whose sum is σ = 722215440. Its totient is φ = 601511680.

The previous prime is 661846819. The next prime is 661846831. The reversal of 661846823 is 328648166.

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

It is not a de Polignac number, because 661846823 - 2² = 661846819 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 (661846853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51863 + ... + 63351.

It is an arithmetic number, because the mean of its divisors is an integer number (90276930).

Almost surely, 2^661846823 is an apocalyptic number.

661846823 is a deficient number, since it is larger than the sum of its proper divisors (60368617).

661846823 is a wasteful number, since it uses less digits than its factorization.

661846823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16737.

The product of its digits is 331776, while the sum is 44.

The square root of 661846823 is about 25726.3837917419. The cubic root of 661846823 is about 871.4701101109.

The spelling of 661846823 in words is "six hundred sixty-one million, eight hundred forty-six thousand, eight hundred twenty-three".