25515717745 has 32 divisors (see below), whose sum is σ = 35447173632. Its totient is φ = 17270502912.

The previous prime is 25515717697. The next prime is 25515717767. The reversal of 25515717745 is 54771751552.

It is a cyclic number.

It is not a de Polignac number, because 25515717745 - 2¹³ = 25515709553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1117059 + ... + 1139671.

It is an arithmetic number, because the mean of its divisors is an integer number (1107724176).

Almost surely, 2^25515717745 is an apocalyptic number.

It is an amenable number.

25515717745 is a deficient number, since it is larger than the sum of its proper divisors (9931455887).

25515717745 is a wasteful number, since it uses less digits than its factorization.

25515717745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23041.

The product of its digits is 1715000, while the sum is 49.

The spelling of 25515717745 in words is "twenty-five billion, five hundred fifteen million, seven hundred seventeen thousand, seven hundred forty-five".