66265501 has 4 divisors (see below), whose sum is σ = 66555100. Its totient is φ = 65975904.

The previous prime is 66265447. The next prime is 66265517. The reversal of 66265501 is 10556266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54022500 + 12243001 = 7350^2 + 3499^2 .

It is a cyclic number.

It is not a de Polignac number, because 66265501 - 2¹³ = 66257309 is a prime.

It is a super-2 number, since 2×66265501² = 8782233245562002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66265571) 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, 144456 + ... + 144913.

It is an arithmetic number, because the mean of its divisors is an integer number (16638775).

Almost surely, 2^66265501 is an apocalyptic number.

It is an amenable number.

66265501 is a deficient number, since it is larger than the sum of its proper divisors (289599).

66265501 is a wasteful number, since it uses less digits than its factorization.

66265501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289598.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 66265501 is about 8140.3624612176. The cubic root of 66265501 is about 404.6651726356.

It can be divided in two parts, 66265 and 501, that added together give a palindrome (66766).

The spelling of 66265501 in words is "sixty-six million, two hundred sixty-five thousand, five hundred one".