6406143772439 has 4 divisors (see below), whose sum is σ = 6493899166656. Its totient is φ = 6318388378224.

The previous prime is 6406143772429. The next prime is 6406143772453. The reversal of 6406143772439 is 9342773416046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6406143772439 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 (6406143772429) 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, 43877696999 + ... + 43877697144.

It is an arithmetic number, because the mean of its divisors is an integer number (1623474791664).

Almost surely, 2^{6406143772439} is an apocalyptic number.

6406143772439 is a deficient number, since it is larger than the sum of its proper divisors (87755394217).

6406143772439 is an equidigital number, since it uses as much as digits as its factorization.

6406143772439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87755394216.

The product of its (nonzero) digits is 18289152, while the sum is 56.

The spelling of 6406143772439 in words is "six trillion, four hundred six billion, one hundred forty-three million, seven hundred seventy-two thousand, four hundred thirty-nine".