66413351 has 4 divisors (see below), whose sum is σ = 69300912. Its totient is φ = 63525792.

The previous prime is 66413299. The next prime is 66413357. The reversal of 66413351 is 15331466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15331466 = 2 ⋅7665733.

It is a cyclic number.

It is not a de Polignac number, because 66413351 - 2⁶ = 66413287 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 (66413357) 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, 1443746 + ... + 1443791.

It is an arithmetic number, because the mean of its divisors is an integer number (17325228).

Almost surely, 2^66413351 is an apocalyptic number.

66413351 is a deficient number, since it is larger than the sum of its proper divisors (2887561).

66413351 is a wasteful number, since it uses less digits than its factorization.

66413351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887560.

The product of its digits is 6480, while the sum is 29.

The square root of 66413351 is about 8149.4386923272. The cubic root of 66413351 is about 404.9659088309.

The spelling of 66413351 in words is "sixty-six million, four hundred thirteen thousand, three hundred fifty-one".