66619870 has 8 divisors (see below), whose sum is σ = 119915784. Its totient is φ = 26647944.

The previous prime is 66619853. The next prime is 66619879. The reversal of 66619870 is 7891666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66619879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3330984 + ... + 3331003.

It is an arithmetic number, because the mean of its divisors is an integer number (14989473).

Almost surely, 2^66619870 is an apocalyptic number.

66619870 is a deficient number, since it is larger than the sum of its proper divisors (53295914).

66619870 is a wasteful number, since it uses less digits than its factorization.

66619870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661994.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 66619870 is about 8162.0996073314. The cubic root of 66619870 is about 405.3852352371.

The spelling of 66619870 in words is "sixty-six million, six hundred nineteen thousand, eight hundred seventy".