57220918361 has 4 divisors (see below), whose sum is σ = 57222612900. Its totient is φ = 57219223824.

The previous prime is 57220918327. The next prime is 57220918367. The reversal of 57220918361 is 16381902275.

57220918361 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 can be written as a sum of positive squares in 2 ways, for example, as 21950200336 + 35270718025 = 148156^2 + 187805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57220918361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57220918367) 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, 795566 + ... + 864503.

It is an arithmetic number, because the mean of its divisors is an integer number (14305653225).

Almost surely, 2^57220918361 is an apocalyptic number.

It is an amenable number.

57220918361 is a deficient number, since it is larger than the sum of its proper divisors (1694539).

57220918361 is a wasteful number, since it uses less digits than its factorization.

57220918361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694538.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 57220918361 in words is "fifty-seven billion, two hundred twenty million, nine hundred eighteen thousand, three hundred sixty-one".