61255566 has 48 divisors (see below), whose sum is σ = 138098688. Its totient is φ = 19602000.

The previous prime is 61255559. The next prime is 61255613. The reversal of 61255566 is 66555216.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61255566.

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, 83895 + ... + 84621.

It is an arithmetic number, because the mean of its divisors is an integer number (2877056).

Almost surely, 2^61255566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61255566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69049344).

61255566 is an abundant number, since it is smaller than the sum of its proper divisors (76843122).

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

61255566 is a wasteful number, since it uses less digits than its factorization.

61255566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 914 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 61255566 is about 7826.5935118671. The cubic root of 61255566 is about 394.1986981664.

The spelling of 61255566 in words is "sixty-one million, two hundred fifty-five thousand, five hundred sixty-six".