661184462556 has 48 divisors (see below), whose sum is σ = 1714411725600. Its totient is φ = 220365277056.

The previous prime is 661184462551. The next prime is 661184462621. The reversal of 661184462556 is 655264481166.

661184462556 is a `hidden beast` number, since 6 + 6 + 1 + 1 + 8 + 4 + 4 + 625 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661184462551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406566 + ... + 1219698.

It is an arithmetic number, because the mean of its divisors is an integer number (35716910950).

Almost surely, 2^661184462556 is an apocalyptic number.

It is a pronic number, being equal to 813132×813133.

It is an amenable number.

661184462556 is an abundant number, since it is smaller than the sum of its proper divisors (1053227263044).

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

661184462556 is a wasteful number, since it uses less digits than its factorization.

661184462556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820675 (or 820667 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 661184462556 in words is "six hundred sixty-one billion, one hundred eighty-four million, four hundred sixty-two thousand, five hundred fifty-six".