66878845 has 16 divisors (see below), whose sum is σ = 89206272. Its totient is φ = 47719360.

The previous prime is 66878839. The next prime is 66878857. The reversal of 66878845 is 54887866.

It is not a de Polignac number, because 66878845 - 2³ = 66878837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66878792 and 66878801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8557 + ... + 14386.

It is an arithmetic number, because the mean of its divisors is an integer number (5575392).

Almost surely, 2^66878845 is an apocalyptic number.

It is an amenable number.

66878845 is a deficient number, since it is larger than the sum of its proper divisors (22327427).

66878845 is a wasteful number, since it uses less digits than its factorization.

66878845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23012.

The product of its digits is 2580480, while the sum is 52.

The square root of 66878845 is about 8177.9487036787. The cubic root of 66878845 is about 405.9098479733.

The spelling of 66878845 in words is "sixty-six million, eight hundred seventy-eight thousand, eight hundred forty-five".