66666894 has 32 divisors (see below), whose sum is σ = 161346816. Its totient is φ = 17927040.

The previous prime is 66666881. The next prime is 66666913. The reversal of 66666894 is 49866666.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

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, 45972 + ... + 47399.

It is an arithmetic number, because the mean of its divisors is an integer number (5042088).

Almost surely, 2^66666894 is an apocalyptic number.

66666894 is an abundant number, since it is smaller than the sum of its proper divisors (94679922).

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

66666894 is a wasteful number, since it uses less digits than its factorization.

66666894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93400.

The product of its digits is 2239488, while the sum is 51.

The square root of 66666894 is about 8164.9797305321. The cubic root of 66666894 is about 405.4805939335.

The spelling of 66666894 in words is "sixty-six million, six hundred sixty-six thousand, eight hundred ninety-four".