66115770 has 64 divisors (see below), whose sum is σ = 182649600. Its totient is φ = 15003648.

The previous prime is 66115769. The next prime is 66115799. The reversal of 66115770 is 7751166.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30234 + ... + 32346.

It is an arithmetic number, because the mean of its divisors is an integer number (2853900).

Almost surely, 2^66115770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66115770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91324800).

66115770 is an abundant number, since it is smaller than the sum of its proper divisors (116533830).

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

66115770 is a wasteful number, since it uses less digits than its factorization.

66115770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 66115770 is about 8131.1604337880. The cubic root of 66115770 is about 404.3601541180.

The spelling of 66115770 in words is "sixty-six million, one hundred fifteen thousand, seven hundred seventy".