215802057025 has 27 divisors (see below), whose sum is σ = 272894440539. Its totient is φ = 169287630720.

The previous prime is 215802057011. The next prime is 215802057041. The reversal of 215802057025 is 520750208512.

The square root of 215802057025 is 464545.

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

It can be written as a sum of positive squares in 13 ways, for example, as 201966651649 + 13835405376 = 449407^2 + 117624^2 .

It is not a de Polignac number, because 215802057025 - 2¹¹ = 215802054977 is a prime.

It is a Duffinian number.

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 26 ways as a sum of consecutive naturals, for example, 123103549 + ... + 123105301.

Almost surely, 2^215802057025 is an apocalyptic number.

215802057025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215802057025 is the 464545-th square number.

215802057025 is the 232273-rd centered octagonal number.

It is an amenable number.

215802057025 is a deficient number, since it is larger than the sum of its proper divisors (57092383514).

215802057025 is an frugal number, since it uses more digits than its factorization.

215802057025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 37.

The spelling of 215802057025 in words is "two hundred fifteen billion, eight hundred two million, fifty-seven thousand, twenty-five".