56642681789 has 4 divisors (see below), whose sum is σ = 56645468160. Its totient is φ = 56639895420.

The previous prime is 56642681761. The next prime is 56642681791. The reversal of 56642681789 is 98718624665.

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.

It is a cyclic number.

It is not a de Polignac number, because 56642681789 - 2⁸ = 56642681533 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 (56642681729) 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, 1362467 + ... + 1403424.

It is an arithmetic number, because the mean of its divisors is an integer number (14161367040).

Almost surely, 2^56642681789 is an apocalyptic number.

It is an amenable number.

56642681789 is a deficient number, since it is larger than the sum of its proper divisors (2786371).

56642681789 is a wasteful number, since it uses less digits than its factorization.

56642681789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786370.

The product of its digits is 34836480, while the sum is 62.

The spelling of 56642681789 in words is "fifty-six billion, six hundred forty-two million, six hundred eighty-one thousand, seven hundred eighty-nine".