56123551989 has 12 divisors (see below), whose sum is σ = 81092657100. Its totient is φ = 37404022464.

The previous prime is 56123551949. The next prime is 56123551999. The reversal of 56123551989 is 98915532165.

56123551989 is a `hidden beast` number, since 5 + 6 + 1 + 2 + 3 + 551 + 9 + 89 = 666.

56123551989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 27362783889 + 28760768100 = 165417^2 + 169590^2 .

It is not a de Polignac number, because 56123551989 - 2⁸ = 56123551733 is a prime.

It is a super-2 number, since 2×56123551989² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56123551909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 942754 + ... + 1000515.

It is an arithmetic number, because the mean of its divisors is an integer number (6757721425).

Almost surely, 2^56123551989 is an apocalyptic number.

It is an amenable number.

56123551989 is a deficient number, since it is larger than the sum of its proper divisors (24969105111).

56123551989 is a wasteful number, since it uses less digits than its factorization.

56123551989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946484 (or 1946481 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 56123551989 in words is "fifty-six billion, one hundred twenty-three million, five hundred fifty-one thousand, nine hundred eighty-nine".