66140856 has 48 divisors (see below), whose sum is σ = 184916160. Its totient is φ = 21335040.

The previous prime is 66140849. The next prime is 66140857. The reversal of 66140856 is 65804166.

It is a super-2 number, since 2×66140856² = 8749225664825472, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66140856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66140857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12585 + ... + 17048.

It is an arithmetic number, because the mean of its divisors is an integer number (3852420).

Almost surely, 2^66140856 is an apocalyptic number.

It is an amenable number.

66140856 is an abundant number, since it is smaller than the sum of its proper divisors (118775304).

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

66140856 is a wasteful number, since it uses less digits than its factorization.

66140856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29676 (or 29669 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66140856 is about 8132.7028717395. The cubic root of 66140856 is about 404.4112891506.

The spelling of 66140856 in words is "sixty-six million, one hundred forty thousand, eight hundred fifty-six".