25520680437781 has 8 divisors (see below), whose sum is σ = 25613467794720. Its totient is φ = 25427897793168.

The previous prime is 25520680437727. The next prime is 25520680437887. The reversal of 25520680437781 is 18773408602552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25520680437781 - 2⁹ = 25520680437269 is a prime.

It is a super-2 number, since 2×25520680437781² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520680437181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9860730 + ... + 12176836.

It is an arithmetic number, because the mean of its divisors is an integer number (3201683474340).

Almost surely, 2^{25520680437781} is an apocalyptic number.

It is an amenable number.

25520680437781 is a deficient number, since it is larger than the sum of its proper divisors (92787356939).

25520680437781 is a wasteful number, since it uses less digits than its factorization.

25520680437781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356163.

The product of its (nonzero) digits is 22579200, while the sum is 58.

The spelling of 25520680437781 in words is "twenty-five trillion, five hundred twenty billion, six hundred eighty million, four hundred thirty-seven thousand, seven hundred eighty-one".