56576778389 has 4 divisors (see below), whose sum is σ = 56662631520. Its totient is φ = 56490925260.

The previous prime is 56576778359. The next prime is 56576778409. The reversal of 56576778389 is 98387767565.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98387767565 = 5 ⋅19677553513.

It is a cyclic number.

It is not a de Polignac number, because 56576778389 - 2³² = 52281811093 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 (56576778359) 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, 42925577 + ... + 42926894.

It is an arithmetic number, because the mean of its divisors is an integer number (14165657880).

Almost surely, 2^56576778389 is an apocalyptic number.

It is an amenable number.

56576778389 is a deficient number, since it is larger than the sum of its proper divisors (85853131).

56576778389 is an equidigital number, since it uses as much as digits as its factorization.

56576778389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85853130.

The product of its digits is 533433600, while the sum is 71.

The spelling of 56576778389 in words is "fifty-six billion, five hundred seventy-six million, seven hundred seventy-eight thousand, three hundred eighty-nine".