671438556439 has 4 divisors (see below), whose sum is σ = 767358350224. Its totient is φ = 575518762656.

The previous prime is 671438556433. The next prime is 671438556461. The reversal of 671438556439 is 934655834176.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 671438556439 - 2¹⁵ = 671438523671 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 (671438556433) 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, 47959896882 + ... + 47959896895.

It is an arithmetic number, because the mean of its divisors is an integer number (191839587556).

Almost surely, 2^671438556439 is an apocalyptic number.

671438556439 is a deficient number, since it is larger than the sum of its proper divisors (95919793785).

671438556439 is an equidigital number, since it uses as much as digits as its factorization.

671438556439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95919793784.

The product of its digits is 65318400, while the sum is 61.

The spelling of 671438556439 in words is "six hundred seventy-one billion, four hundred thirty-eight million, five hundred fifty-six thousand, four hundred thirty-nine".