71471215024225 has 27 divisors (see below), whose sum is σ = 88853057820499. Its totient is φ = 57029769839600.

The previous prime is 71471215024213. The next prime is 71471215024243. The reversal of 71471215024225 is 52242051217417.

The square root of 71471215024225 is 8454065.

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., 25729637408721 + 45741577615504 = 5072439^2 + 6763252^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71471215024225 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 (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18218508114 + ... + 18218512036.

Almost surely, 2^{71471215024225} is an apocalyptic number.

71471215024225 is the 8454065-th square number.

71471215024225 is the 4227033-rd centered octagonal number.

It is an amenable number.

71471215024225 is a deficient number, since it is larger than the sum of its proper divisors (17381842796274).

71471215024225 is an frugal number, since it uses more digits than its factorization.

71471215024225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8718 (or 4359 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 43.

The spelling of 71471215024225 in words is "seventy-one trillion, four hundred seventy-one billion, two hundred fifteen million, twenty-four thousand, two hundred twenty-five".