66616140 has 24 divisors (see below), whose sum is σ = 186525360. Its totient is φ = 17764288.

The previous prime is 66616139. The next prime is 66616171. The reversal of 66616140 is 4161666.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66616098 and 66616107.

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, 555075 + ... + 555194.

It is an arithmetic number, because the mean of its divisors is an integer number (7771890).

Almost surely, 2^66616140 is an apocalyptic number.

66616140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66616140 is an abundant number, since it is smaller than the sum of its proper divisors (119909220).

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

66616140 is a wasteful number, since it uses less digits than its factorization.

66616140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110281 (or 1110279 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66616140 is about 8161.8711090044. The cubic root of 66616140 is about 405.3776693505.

The spelling of 66616140 in words is "sixty-six million, six hundred sixteen thousand, one hundred forty".