215861505625 has 120 divisors (see below), whose sum is σ = 311505286400. Its totient is φ = 148936320000.

The previous prime is 215861505599. The next prime is 215861505637. The reversal of 215861505625 is 526505168512.

It is not a de Polignac number, because 215861505625 - 2¹¹ = 215861503577 is a prime.

It is a super-2 number, since 2×215861505625² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 106387111 + ... + 106389139.

Almost surely, 2^215861505625 is an apocalyptic number.

215861505625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215861505625 is a deficient number, since it is larger than the sum of its proper divisors (95643780775).

215861505625 is a wasteful number, since it uses less digits than its factorization.

215861505625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133 (or 2101 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 46.

The spelling of 215861505625 in words is "two hundred fifteen billion, eight hundred sixty-one million, five hundred five thousand, six hundred twenty-five".