66774589 has 32 divisors (see below), whose sum is σ = 87146496. Its totient is φ = 49800960.

The previous prime is 66774583. The next prime is 66774601. The reversal of 66774589 is 98547766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66774589 - 2³ = 66774581 is a prime.

It is a super-2 number, since 2×66774589² = 8917691472237842, 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 (66774581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84454 + ... + 85240.

It is an arithmetic number, because the mean of its divisors is an integer number (2723328).

Almost surely, 2^66774589 is an apocalyptic number.

It is an amenable number.

66774589 is a deficient number, since it is larger than the sum of its proper divisors (20371907).

66774589 is a wasteful number, since it uses less digits than its factorization.

66774589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its digits is 2540160, while the sum is 52.

The square root of 66774589 is about 8171.5720029869. The cubic root of 66774589 is about 405.6988168867.

The spelling of 66774589 in words is "sixty-six million, seven hundred seventy-four thousand, five hundred eighty-nine".