66315678 has 32 divisors (see below), whose sum is σ = 155820672. Its totient is φ = 18549600.

The previous prime is 66315677. The next prime is 66315679. The reversal of 66315678 is 87651366.

It is an interprime number because it is at equal distance from previous prime (66315677) and next prime (66315679).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66315671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37788 + ... + 39503.

It is an arithmetic number, because the mean of its divisors is an integer number (4869396).

Almost surely, 2^66315678 is an apocalyptic number.

66315678 is an abundant number, since it is smaller than the sum of its proper divisors (89504994).

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

66315678 is a wasteful number, since it uses less digits than its factorization.

66315678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77320.

The product of its digits is 181440, while the sum is 42.

The square root of 66315678 is about 8143.4438660802. The cubic root of 66315678 is about 404.7672859081.

The spelling of 66315678 in words is "sixty-six million, three hundred fifteen thousand, six hundred seventy-eight".