66404331213 has 16 divisors (see below), whose sum is σ = 96678523200. Its totient is φ = 40207380480.

The previous prime is 66404331199. The next prime is 66404331221. The reversal of 66404331213 is 31213340466.

It is not a de Polignac number, because 66404331213 - 2¹⁷ = 66404200141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404331313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905908 + ... + 976461.

It is an arithmetic number, because the mean of its divisors is an integer number (6042407700).

Almost surely, 2^66404331213 is an apocalyptic number.

It is an amenable number.

66404331213 is a deficient number, since it is larger than the sum of its proper divisors (30274191987).

66404331213 is a wasteful number, since it uses less digits than its factorization.

66404331213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883452.

The product of its (nonzero) digits is 31104, while the sum is 33.

Adding to 66404331213 its reverse (31213340466), we get a palindrome (97617671679).

The spelling of 66404331213 in words is "sixty-six billion, four hundred four million, three hundred thirty-one thousand, two hundred thirteen".