9999540462025 has 27 divisors (see below), whose sum is σ = 12744352786431. Its totient is φ = 7782970731840.

The previous prime is 9999540462013. The next prime is 9999540462049. The reversal of 9999540462025 is 5202640459999.

The square root of 9999540462025 is 3162205.

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 1679338667449 + 8320201794576 = 1295893^2 + 2884476^2 .

It is not a de Polignac number, because 9999540462025 - 2⁵ = 9999540461993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 584999379 + ... + 585016471.

Almost surely, 2^{9999540462025} is an apocalyptic number.

9999540462025 is the 3162205-th square number.

9999540462025 is the 1581103-rd centered octagonal number.

It is an amenable number.

9999540462025 is a deficient number, since it is larger than the sum of its proper divisors (2744812324406).

9999540462025 is an frugal number, since it uses more digits than its factorization.

9999540462025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34270 (or 17135 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 64.

Multiplying 9999540462025 by its sum of digits (64), we get a square (639970589569600 = 25297640²).

The spelling of 9999540462025 in words is "nine trillion, nine hundred ninety-nine billion, five hundred forty million, four hundred sixty-two thousand, twenty-five".