56121612247 has 4 divisors (see below), whose sum is σ = 57638412616. Its totient is φ = 54604811880.

The previous prime is 56121612233. The next prime is 56121612269. The reversal of 56121612247 is 74221612165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74221612165 = 5 ⋅14844322433.

It is a cyclic number.

It is not a de Polignac number, because 56121612247 - 2¹¹ = 56121610199 is a prime.

It is a super-2 number, since 2×56121612247² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1516800331 = 56121612247 / (5 + 6 + 1 + 2 + 1 + 6 + 1 + 2 + 2 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56121612647) 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, 758400129 + ... + 758400202.

It is an arithmetic number, because the mean of its divisors is an integer number (14409603154).

Almost surely, 2^56121612247 is an apocalyptic number.

56121612247 is a deficient number, since it is larger than the sum of its proper divisors (1516800369).

56121612247 is a wasteful number, since it uses less digits than its factorization.

56121612247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516800368.

The product of its digits is 40320, while the sum is 37.

The spelling of 56121612247 in words is "fifty-six billion, one hundred twenty-one million, six hundred twelve thousand, two hundred forty-seven".