661085583228 has 36 divisors (see below), whose sum is σ = 1909802796720. Its totient is φ = 188881595136.

The previous prime is 661085583217. The next prime is 661085583239. The reversal of 661085583228 is 822385580166.

661085583228 is a `hidden beast` number, since 6 + 61 + 0 + 8 + 558 + 3 + 2 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (661085583217) and next prime (661085583239).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1311677493 + ... + 1311677996.

Almost surely, 2^661085583228 is an apocalyptic number.

It is an amenable number.

661085583228 is an abundant number, since it is smaller than the sum of its proper divisors (1248717213492).

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

661085583228 is a wasteful number, since it uses less digits than its factorization.

661085583228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623355506 (or 2623355501 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 661085583228 in words is "six hundred sixty-one billion, eighty-five million, five hundred eighty-three thousand, two hundred twenty-eight".