66875616 has 36 divisors (see below), whose sum is σ = 190178352. Its totient is φ = 22291776.

The previous prime is 66875609. The next prime is 66875617. The reversal of 66875616 is 61657866.

66875616 is a `hidden beast` number, since 6 + 6 + 87 + 561 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 2 and base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66875617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115816 + ... + 116391.

It is an arithmetic number, because the mean of its divisors is an integer number (5282732).

Almost surely, 2^66875616 is an apocalyptic number.

It is an amenable number.

66875616 is an abundant number, since it is smaller than the sum of its proper divisors (123302736).

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

66875616 is a wasteful number, since it uses less digits than its factorization.

66875616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232223 (or 232212 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66875616 is about 8177.7512801503. The cubic root of 66875616 is about 405.9033152449.

The spelling of 66875616 in words is "sixty-six million, eight hundred seventy-five thousand, six hundred sixteen".