66275538 has 24 divisors (see below), whose sum is σ = 154192752. Its totient is φ = 18935784.

The previous prime is 66275533. The next prime is 66275563. The reversal of 66275538 is 83557266.

It is a super-3 number, since 3×66275538³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66275538.

It is not an unprimeable number, because it can be changed into a prime (66275533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112420 + ... + 113007.

It is an arithmetic number, because the mean of its divisors is an integer number (6424698).

Almost surely, 2^66275538 is an apocalyptic number.

66275538 is an abundant number, since it is smaller than the sum of its proper divisors (87917214).

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

66275538 is a wasteful number, since it uses less digits than its factorization.

66275538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225446 (or 225439 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 66275538 is about 8140.9789337647. The cubic root of 66275538 is about 404.6856026695.

The spelling of 66275538 in words is "sixty-six million, two hundred seventy-five thousand, five hundred thirty-eight".