66635340 has 24 divisors (see below), whose sum is σ = 186579120. Its totient is φ = 17769408.

The previous prime is 66635339. The next prime is 66635341. The reversal of 66635340 is 4353666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66635339) and next prime (66635341).

It is not an unprimeable number, because it can be changed into a prime (66635341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555235 + ... + 555354.

It is an arithmetic number, because the mean of its divisors is an integer number (7774130).

Almost surely, 2^66635340 is an apocalyptic number.

66635340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66635340 is an abundant number, since it is smaller than the sum of its proper divisors (119943780).

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

66635340 is a wasteful number, since it uses less digits than its factorization.

66635340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110601 (or 1110599 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 66635340 is about 8163.0472251482. The cubic root of 66635340 is about 405.4166113827.

The spelling of 66635340 in words is "sixty-six million, six hundred thirty-five thousand, three hundred forty".