66641696 has 48 divisors (see below), whose sum is σ = 144916128. Its totient is φ = 29913600.

The previous prime is 66641677. The next prime is 66641711. The reversal of 66641696 is 69614666.

It is a super-2 number, since 2×66641696² = 8882231291512832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28076 + ... + 30356.

It is an arithmetic number, because the mean of its divisors is an integer number (3019086).

Almost surely, 2^66641696 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 66641696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72458064).

66641696 is an abundant number, since it is smaller than the sum of its proper divisors (78274432).

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

66641696 is a wasteful number, since it uses less digits than its factorization.

66641696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385 (or 2377 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The square root of 66641696 is about 8163.4365312655. The cubic root of 66641696 is about 405.4295011699.

The spelling of 66641696 in words is "sixty-six million, six hundred forty-one thousand, six hundred ninety-six".