66415050133213 has 4 divisors (see below), whose sum is σ = 66415068843228. Its totient is φ = 66415031423200.

The previous prime is 66415050133207. The next prime is 66415050133231. The reversal of 66415050133213 is 31233105051466.

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 61614932832324 + 4800117300889 = 7849518^2 + 2190917^2 .

It is a cyclic number.

It is not a de Polignac number, because 66415050133213 - 2⁹ = 66415050132701 is a prime.

It is a super-2 number, since 2×66415050133213² (a number of 28 digits) 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 (66415050133813) 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, 2212888 + ... + 11735713.

It is an arithmetic number, because the mean of its divisors is an integer number (16603767210807).

Almost surely, 2^{66415050133213} is an apocalyptic number.

It is an amenable number.

66415050133213 is a deficient number, since it is larger than the sum of its proper divisors (18710015).

66415050133213 is a wasteful number, since it uses less digits than its factorization.

66415050133213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18710014.

The product of its (nonzero) digits is 194400, while the sum is 40.

Adding to 66415050133213 its reverse (31233105051466), we get a palindrome (97648155184679).

The spelling of 66415050133213 in words is "sixty-six trillion, four hundred fifteen billion, fifty million, one hundred thirty-three thousand, two hundred thirteen".