56161531243 has 4 divisors (see below), whose sum is σ = 56471816128. Its totient is φ = 55851246360.

The previous prime is 56161531241. The next prime is 56161531247. The reversal of 56161531243 is 34213516165.

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

It is a cyclic number.

It is not a de Polignac number, because 56161531243 - 2¹ = 56161531241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56161531241) 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, 155142171 + ... + 155142532.

It is an arithmetic number, because the mean of its divisors is an integer number (14117954032).

Almost surely, 2^56161531243 is an apocalyptic number.

56161531243 is a deficient number, since it is larger than the sum of its proper divisors (310284885).

56161531243 is a wasteful number, since it uses less digits than its factorization.

56161531243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310284884.

The product of its digits is 64800, while the sum is 37.

The spelling of 56161531243 in words is "fifty-six billion, one hundred sixty-one million, five hundred thirty-one thousand, two hundred forty-three".