215285596857 has 12 divisors (see below), whose sum is σ = 310978460260. Its totient is φ = 143518942368.

The previous prime is 215285596837. The next prime is 215285596861. The reversal of 215285596857 is 758695582512.

215285596857 is a `hidden beast` number, since 2 + 1 + 5 + 28 + 559 + 6 + 8 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 67709764521 + 147575832336 = 260211^2 + 384156^2 .

It is not a de Polignac number, because 215285596857 - 2⁸ = 215285596601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215285596794 and 215285596803.

It is not an unprimeable number, because it can be changed into a prime (215285596807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102778 + ... + 664179.

Almost surely, 2^215285596857 is an apocalyptic number.

It is an amenable number.

215285596857 is a deficient number, since it is larger than the sum of its proper divisors (95692863403).

215285596857 is a wasteful number, since it uses less digits than its factorization.

215285596857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798152 (or 798149 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 63.

The spelling of 215285596857 in words is "two hundred fifteen billion, two hundred eighty-five million, five hundred ninety-six thousand, eight hundred fifty-seven".