61223140566 has 48 divisors (see below), whose sum is σ = 151621869984. Its totient is φ = 17489820672.

The previous prime is 61223140549. The next prime is 61223140579. The reversal of 61223140566 is 66504132216.

61223140566 is a `hidden beast` number, since 6 + 1 + 22 + 31 + 40 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61223140566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 961140 + ... + 1022856.

It is an arithmetic number, because the mean of its divisors is an integer number (3158788958).

Almost surely, 2^61223140566 is an apocalyptic number.

61223140566 is an abundant number, since it is smaller than the sum of its proper divisors (90398729418).

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

61223140566 is a wasteful number, since it uses less digits than its factorization.

61223140566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69605 (or 69602 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 61223140566 in words is "sixty-one billion, two hundred twenty-three million, one hundred forty thousand, five hundred sixty-six".