57661243727 has 4 divisors (see below), whose sum is σ = 58309122960. Its totient is φ = 57013364496.

The previous prime is 57661243697. The next prime is 57661243729. The reversal of 57661243727 is 72734216675.

57661243727 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 57661243727 - 2¹⁶ = 57661178191 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 (57661243729) 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, 323939483 + ... + 323939660.

It is an arithmetic number, because the mean of its divisors is an integer number (14577280740).

Almost surely, 2^57661243727 is an apocalyptic number.

57661243727 is a deficient number, since it is larger than the sum of its proper divisors (647879233).

57661243727 is an equidigital number, since it uses as much as digits as its factorization.

57661243727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647879232.

The product of its digits is 2963520, while the sum is 50.

The spelling of 57661243727 in words is "fifty-seven billion, six hundred sixty-one million, two hundred forty-three thousand, seven hundred twenty-seven".