40891612569025 has 27 divisors (see below), whose sum is σ = 51358739660361. Its totient is φ = 32297202643680.

The previous prime is 40891612569023. The next prime is 40891612569061. The reversal of 40891612569025 is 52096521619804.

The square root of 40891612569025 is 6394655.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1092875795649 + 39798736773376 = 1045407^2 + 6308624^2 .

It is not a de Polignac number, because 40891612569025 - 2¹ = 40891612569023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40891612569023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2525880631 + ... + 2525896819.

Almost surely, 2^{40891612569025} is an apocalyptic number.

40891612569025 is the 6394655-th square number.

40891612569025 is the 3197328-th centered octagonal number.

It is an amenable number.

40891612569025 is a deficient number, since it is larger than the sum of its proper divisors (10467127091336).

40891612569025 is an frugal number, since it uses more digits than its factorization.

40891612569025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32546 (or 16273 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 40891612569025 in words is "forty trillion, eight hundred ninety-one billion, six hundred twelve million, five hundred sixty-nine thousand, twenty-five".