9959357664025 has 135 divisors (see below), whose sum is σ = 15849343095999. Its totient is φ = 6203128932000.

The previous prime is 9959357664023. The next prime is 9959357664031. The reversal of 9959357664025 is 5204667539599.

The square root of 9959357664025 is 3155845.

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., 3585368759049 + 6373988904976 = 1893507^2 + 2524676^2 .

It is not a de Polignac number, because 9959357664025 - 2¹ = 9959357664023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9959357664023) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 8505001690 + ... + 8505002860.

Almost surely, 2^{9959357664025} is an apocalyptic number.

9959357664025 is the 3155845-th square number.

9959357664025 is the 1577923-rd centered octagonal number.

It is an amenable number.

9959357664025 is a deficient number, since it is larger than the sum of its proper divisors (5889985431974).

9959357664025 is an frugal number, since it uses more digits than its factorization.

9959357664025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 551124000, while the sum is 70.

The spelling of 9959357664025 in words is "nine trillion, nine hundred fifty-nine billion, three hundred fifty-seven million, six hundred sixty-four thousand, twenty-five".