66426847 has 8 divisors (see below), whose sum is σ = 68251680. Its totient is φ = 64611840.

The previous prime is 66426827. The next prime is 66426851. The reversal of 66426847 is 74862466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66426847 - 2⁷ = 66426719 is a prime.

It is a super-2 number, since 2×66426847² = 8825052004722818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66426827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12463 + ... + 16975.

It is an arithmetic number, because the mean of its divisors is an integer number (8531460).

Almost surely, 2^66426847 is an apocalyptic number.

66426847 is a deficient number, since it is larger than the sum of its proper divisors (1824833).

66426847 is a wasteful number, since it uses less digits than its factorization.

66426847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4913.

The product of its digits is 387072, while the sum is 43.

The square root of 66426847 is about 8150.2666827534. The cubic root of 66426847 is about 404.9933383043.

The spelling of 66426847 in words is "sixty-six million, four hundred twenty-six thousand, eight hundred forty-seven".