66395557 has 8 divisors (see below), whose sum is σ = 74001600. Its totient is φ = 59200704.

The previous prime is 66395531. The next prime is 66395599. The reversal of 66395557 is 75559366.

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 66395557 - 2⁷ = 66395429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66395507) 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, 102457 + ... + 103102.

It is an arithmetic number, because the mean of its divisors is an integer number (9250200).

Almost surely, 2^66395557 is an apocalyptic number.

It is an amenable number.

66395557 is a deficient number, since it is larger than the sum of its proper divisors (7606043).

66395557 is a wasteful number, since it uses less digits than its factorization.

66395557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205595.

The product of its digits is 850500, while the sum is 46.

The square root of 66395557 is about 8148.3468875595. The cubic root of 66395557 is about 404.9297383575.

The spelling of 66395557 in words is "sixty-six million, three hundred ninety-five thousand, five hundred fifty-seven".