66545534 has 8 divisors (see below), whose sum is σ = 108892728. Its totient is φ = 30247960.

The previous prime is 66545533. The next prime is 66545551. The reversal of 66545534 is 43554566.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1512377 + ... + 1512420.

It is an arithmetic number, because the mean of its divisors is an integer number (13611591).

Almost surely, 2^66545534 is an apocalyptic number.

66545534 is a deficient number, since it is larger than the sum of its proper divisors (42347194).

66545534 is a wasteful number, since it uses less digits than its factorization.

66545534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024810.

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

The square root of 66545534 is about 8157.5446060687. The cubic root of 66545534 is about 405.2343996974.

The spelling of 66545534 in words is "sixty-six million, five hundred forty-five thousand, five hundred thirty-four".