66801340 has 48 divisors (see below), whose sum is σ = 148377600. Its totient is φ = 25192512.

The previous prime is 66801331. The next prime is 66801349. The reversal of 66801340 is 4310866.

It is an interprime number because it is at equal distance from previous prime (66801331) and next prime (66801349).

It is a junction number, because it is equal to n+sod(n) for n = 66801299 and 66801308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66801349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139221 + ... + 139699.

It is an arithmetic number, because the mean of its divisors is an integer number (3091200).

Almost surely, 2^66801340 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 66801340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74188800).

66801340 is an abundant number, since it is smaller than the sum of its proper divisors (81576260).

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

66801340 is a wasteful number, since it uses less digits than its factorization.

66801340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66801340 is about 8173.2086722413. The cubic root of 66801340 is about 405.7529861960.

The spelling of 66801340 in words is "sixty-six million, eight hundred one thousand, three hundred forty".