66427805 has 16 divisors (see below), whose sum is σ = 82071360. Its totient is φ = 51593088.

The previous prime is 66427793. The next prime is 66427811. The reversal of 66427805 is 50872466.

66427805 = T₁₄₇₁ + T₁₄₇₂ + ... + T₁₅₂₉.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66427805 - 2⁸ = 66427549 is a prime.

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, 23129 + ... + 25841.

It is an arithmetic number, because the mean of its divisors is an integer number (5129460).

Almost surely, 2^66427805 is an apocalyptic number.

It is an amenable number.

66427805 is a deficient number, since it is larger than the sum of its proper divisors (15643555).

66427805 is a wasteful number, since it uses less digits than its factorization.

66427805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 66427805 is about 8150.3254536245. The cubic root of 66427805 is about 404.9952852167.

The spelling of 66427805 in words is "sixty-six million, four hundred twenty-seven thousand, eight hundred five".