56439396589821 has 128 divisors (see below), whose sum is σ = 91342165770240. Its totient is φ = 30280957056000.

The previous prime is 56439396589789. The next prime is 56439396589837. The reversal of 56439396589821 is 12898569393465.

It is not a de Polignac number, because 56439396589821 - 2⁵ = 56439396589789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56439396589421) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 20149729621 + ... + 20149732421.

It is an arithmetic number, because the mean of its divisors is an integer number (713610670080).

Almost surely, 2^{56439396589821} is an apocalyptic number.

It is an amenable number.

56439396589821 is a deficient number, since it is larger than the sum of its proper divisors (34902769180419).

56439396589821 is a wasteful number, since it uses less digits than its factorization.

56439396589821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015.

The product of its digits is 3023308800, while the sum is 78.

The spelling of 56439396589821 in words is "fifty-six trillion, four hundred thirty-nine billion, three hundred ninety-six million, five hundred eighty-nine thousand, eight hundred twenty-one".