66745746 has 24 divisors (see below), whose sum is σ = 152227920. Its totient is φ = 21077496.

The previous prime is 66745717. The next prime is 66745753. The reversal of 66745746 is 64754766.

It is a happy number.

66745746 is a `hidden beast` number, since 6 + 6 + 74 + 574 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97240 + ... + 97923.

It is an arithmetic number, because the mean of its divisors is an integer number (6342830).

Almost surely, 2^66745746 is an apocalyptic number.

66745746 is an abundant number, since it is smaller than the sum of its proper divisors (85482174).

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

66745746 is a wasteful number, since it uses less digits than its factorization.

66745746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195190 (or 195187 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 66745746 is about 8169.8069744640. The cubic root of 66745746 is about 405.6403951808.

The spelling of 66745746 in words is "sixty-six million, seven hundred forty-five thousand, seven hundred forty-six".