25601909997465 has 192 divisors, whose sum is σ = 50376128313600. Its totient is φ = 12293304339456.

The previous prime is 25601909997407. The next prime is 25601909997491. The reversal of 25601909997465 is 56479990910652.

25601909997465 is a `hidden beast` number, since 2 + 5 + 60 + 19 + 0 + 9 + 9 + 97 + 465 = 666.

It is not a de Polignac number, because 25601909997465 - 2¹³ = 25601909989273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25601909997393 and 25601909997402.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 175406397 + ... + 175552293.

It is an arithmetic number, because the mean of its divisors is an integer number (262375668300).

Almost surely, 2^{25601909997465} is an apocalyptic number.

It is an amenable number.

25601909997465 is a deficient number, since it is larger than the sum of its proper divisors (24774218316135).

25601909997465 is a wasteful number, since it uses less digits than its factorization.

25601909997465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146053 (or 146004 counting only the distinct ones).

The product of its (nonzero) digits is 330674400, while the sum is 72.

The spelling of 25601909997465 in words is "twenty-five trillion, six hundred one billion, nine hundred nine million, nine hundred ninety-seven thousand, four hundred sixty-five".