66015451 has 4 divisors (see below), whose sum is σ = 68885712. Its totient is φ = 63145192.

The previous prime is 66015431. The next prime is 66015473. The reversal of 66015451 is 15451066.

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

It is a cyclic number.

It is not a de Polignac number, because 66015451 - 2⁵ = 66015419 is a prime.

It is a super-3 number, since 3×66015451³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66015421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1435096 + ... + 1435141.

It is an arithmetic number, because the mean of its divisors is an integer number (17221428).

Almost surely, 2^66015451 is an apocalyptic number.

66015451 is a deficient number, since it is larger than the sum of its proper divisors (2870261).

66015451 is a wasteful number, since it uses less digits than its factorization.

66015451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870260.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 66015451 is about 8124.9892923006. The cubic root of 66015451 is about 404.1555355610.

It can be divided in two parts, 66015 and 451, that added together give a palindrome (66466).

The spelling of 66015451 in words is "sixty-six million, fifteen thousand, four hundred fifty-one".