57138237561 has 8 divisors (see below), whose sum is σ = 76191537600. Its totient is φ = 38088547952.

The previous prime is 57138237551. The next prime is 57138237581. The reversal of 57138237561 is 16573283175.

57138237561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57138237561 - 2¹¹ = 57138235513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57138237561.

It is not an unprimeable number, because it can be changed into a prime (57138237511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865461 + ... + 929138.

It is an arithmetic number, because the mean of its divisors is an integer number (9523942200).

Almost surely, 2^57138237561 is an apocalyptic number.

It is an amenable number.

57138237561 is a deficient number, since it is larger than the sum of its proper divisors (19053300039).

57138237561 is a wasteful number, since it uses less digits than its factorization.

57138237561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805215.

The product of its digits is 1058400, while the sum is 48.

The spelling of 57138237561 in words is "fifty-seven billion, one hundred thirty-eight million, two hundred thirty-seven thousand, five hundred sixty-one".