66405143013 has 32 divisors (see below), whose sum is σ = 106093532160. Its totient is φ = 36469635840.

The previous prime is 66405143003. The next prime is 66405143023. The reversal of 66405143013 is 31034150466.

It is an interprime number because it is at equal distance from previous prime (66405143003) and next prime (66405143023).

It is not a de Polignac number, because 66405143013 - 2⁸ = 66405142757 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 (66405143003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2287956 + ... + 2316797.

It is an arithmetic number, because the mean of its divisors is an integer number (3315422880).

Almost surely, 2^66405143013 is an apocalyptic number.

It is an amenable number.

66405143013 is a deficient number, since it is larger than the sum of its proper divisors (39688389147).

66405143013 is a wasteful number, since it uses less digits than its factorization.

66405143013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604809.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 66405143013 its reverse (31034150466), we get a palindrome (97439293479).

The spelling of 66405143013 in words is "sixty-six billion, four hundred five million, one hundred forty-three thousand, thirteen".