66661704 has 96 divisors (see below), whose sum is σ = 191056320. Its totient is φ = 21767616.

The previous prime is 66661669. The next prime is 66661733. The reversal of 66661704 is 40716666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 102709 + ... + 103355.

It is an arithmetic number, because the mean of its divisors is an integer number (1990170).

Almost surely, 2^66661704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66661704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95528160).

66661704 is an abundant number, since it is smaller than the sum of its proper divisors (124394616).

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

66661704 is a wasteful number, since it uses less digits than its factorization.

66661704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 66661704 is about 8164.6619035940. The cubic root of 66661704 is about 405.4700714749.

The spelling of 66661704 in words is "sixty-six million, six hundred sixty-one thousand, seven hundred four".