66345554 has 16 divisors (see below), whose sum is σ = 108832896. Its totient is φ = 30082800.

The previous prime is 66345553. The next prime is 66345557. The reversal of 66345554 is 45554366.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66345553) 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, 5984 + ... + 12980.

It is an arithmetic number, because the mean of its divisors is an integer number (6802056).

Almost surely, 2^66345554 is an apocalyptic number.

66345554 is a deficient number, since it is larger than the sum of its proper divisors (42487342).

66345554 is a wasteful number, since it uses less digits than its factorization.

66345554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7441.

The product of its digits is 216000, while the sum is 38.

The square root of 66345554 is about 8145.2780185823. The cubic root of 66345554 is about 404.8280609378.

The spelling of 66345554 in words is "sixty-six million, three hundred forty-five thousand, five hundred fifty-four".