66640214 has 8 divisors (see below), whose sum is σ = 100679880. Its totient is φ = 33080256.

The previous prime is 66640199. The next prime is 66640229. The reversal of 66640214 is 41204666.

It is an interprime number because it is at equal distance from previous prime (66640199) and next prime (66640229).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119579 + ... + 120134.

It is an arithmetic number, because the mean of its divisors is an integer number (12584985).

Almost surely, 2^66640214 is an apocalyptic number.

66640214 is a deficient number, since it is larger than the sum of its proper divisors (34039666).

66640214 is a wasteful number, since it uses less digits than its factorization.

66640214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239854.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 66640214 is about 8163.3457601648. The cubic root of 66640214 is about 405.4264957894.

The spelling of 66640214 in words is "sixty-six million, six hundred forty thousand, two hundred fourteen".