66613870 has 16 divisors (see below), whose sum is σ = 124040160. Its totient is φ = 25726624.

The previous prime is 66613861. The next prime is 66613901. The reversal of 66613870 is 7831666.

It is a congruent number.

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, 114562 + ... + 115141.

It is an arithmetic number, because the mean of its divisors is an integer number (7752510).

Almost surely, 2^66613870 is an apocalyptic number.

66613870 is a deficient number, since it is larger than the sum of its proper divisors (57426290).

66613870 is a wasteful number, since it uses less digits than its factorization.

66613870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229739.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66613870 is about 8161.7320465695. The cubic root of 66613870 is about 405.3730647719.

The spelling of 66613870 in words is "sixty-six million, six hundred thirteen thousand, eight hundred seventy".