57278695656361 has 27 divisors (see below), whose sum is σ = 58834246979991. Its totient is φ = 55763732545824.

The previous prime is 57278695656331. The next prime is 57278695656389. The reversal of 57278695656361 is 16365659687275.

The square root of 57278695656361 is 7568269.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9440446745961 + 47838248910400 = 3072531^2 + 6916520^2 .

It is not a de Polignac number, because 57278695656361 - 2⁹ = 57278695655849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57278695656331) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 100665545685 + ... + 100665546253.

Almost surely, 2^{57278695656361} is an apocalyptic number.

57278695656361 is the 7568269-th square number.

57278695656361 is the 3784135-th centered octagonal number.

It is an amenable number.

57278695656361 is a deficient number, since it is larger than the sum of its proper divisors (1555551323630).

57278695656361 is an frugal number, since it uses more digits than its factorization.

57278695656361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798 (or 899 counting only the distinct ones).

The product of its digits is 3429216000, while the sum is 76.

The spelling of 57278695656361 in words is "fifty-seven trillion, two hundred seventy-eight billion, six hundred ninety-five million, six hundred fifty-six thousand, three hundred sixty-one".