1215565025 has 48 divisors (see below), whose sum is σ = 1658465280. Its totient is φ = 879820800.

The previous prime is 1215565003. The next prime is 1215565027. The reversal of 1215565025 is 5205655121.

It is not a de Polignac number, because 1215565025 - 2¹⁰ = 1215564001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1215564982 and 1215565000.

It is not an unprimeable number, because it can be changed into a prime (1215565027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3385796 + ... + 3386154.

It is an arithmetic number, because the mean of its divisors is an integer number (34551360).

Almost surely, 2^1215565025 is an apocalyptic number.

It is an amenable number.

1215565025 is a deficient number, since it is larger than the sum of its proper divisors (442900255).

1215565025 is a wasteful number, since it uses less digits than its factorization.

1215565025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 1215565025 is about 34864.9541086748. The cubic root of 1215565025 is about 1067.2333758889.

The spelling of 1215565025 in words is "one billion, two hundred fifteen million, five hundred sixty-five thousand, twenty-five".