66678354 has 12 divisors (see below), whose sum is σ = 144469806. Its totient is φ = 22226112.

The previous prime is 66678347. The next prime is 66678379. The reversal of 66678354 is 45387666.

It can be written as a sum of positive squares in only one way, i.e., 43204329 + 23474025 = 6573^2 + 4845^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1852159 + ... + 1852194.

Almost surely, 2^66678354 is an apocalyptic number.

66678354 is an abundant number, since it is smaller than the sum of its proper divisors (77791452).

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

66678354 is a wasteful number, since it uses less digits than its factorization.

66678354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704361 (or 3704358 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 66678354 is about 8165.6814779907. The cubic root of 66678354 is about 405.5038265611.

The spelling of 66678354 in words is "sixty-six million, six hundred seventy-eight thousand, three hundred fifty-four".