61056666 has 88 divisors (see below), whose sum is σ = 153054144. Its totient is φ = 18108360.

The previous prime is 61056659. The next prime is 61056683. The reversal of 61056666 is 66665016.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61056666.

It is an unprimeable number.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 1299055 + ... + 1299101.

Almost surely, 2^61056666 is an apocalyptic number.

61056666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 61056666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76527072).

61056666 is an abundant number, since it is smaller than the sum of its proper divisors (91997478).

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

61056666 is an equidigital number, since it uses as much as digits as its factorization.

61056666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 61056666 is about 7813.8765027354. The cubic root of 61056666 is about 393.7715743281.

The spelling of 61056666 in words is "sixty-one million, fifty-six thousand, six hundred sixty-six".