56940097561 has 4 divisors (see below), whose sum is σ = 56975753572. Its totient is φ = 56904441552.

The previous prime is 56940097549. The next prime is 56940097583. The reversal of 56940097561 is 16579004965.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6186766336 + 50753331225 = 78656^2 + 225285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56940097561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56940097499 and 56940097508.

It is not an unprimeable number, because it can be changed into a prime (56940097661) 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, 17825610 + ... + 17828803.

It is an arithmetic number, because the mean of its divisors is an integer number (14243938393).

Almost surely, 2^56940097561 is an apocalyptic number.

It is an amenable number.

56940097561 is a deficient number, since it is larger than the sum of its proper divisors (35656011).

56940097561 is a wasteful number, since it uses less digits than its factorization.

56940097561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35656010.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 56940097561 in words is "fifty-six billion, nine hundred forty million, ninety-seven thousand, five hundred sixty-one".