661431846 has 32 divisors (see below), whose sum is σ = 1352775168. Its totient is φ = 215504480.

The previous prime is 661431829. The next prime is 661431847. The reversal of 661431846 is 648134166.

661431846 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661431847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420241 + ... + 421811.

It is an arithmetic number, because the mean of its divisors is an integer number (42274224).

Almost surely, 2^661431846 is an apocalyptic number.

661431846 is an abundant number, since it is smaller than the sum of its proper divisors (691343322).

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

661431846 is a wasteful number, since it uses less digits than its factorization.

661431846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116.

The product of its digits is 82944, while the sum is 39.

The square root of 661431846 is about 25718.3173244285. The cubic root of 661431846 is about 871.2879351986.

The spelling of 661431846 in words is "six hundred sixty-one million, four hundred thirty-one thousand, eight hundred forty-six".