25780647261 has 8 divisors (see below), whose sum is σ = 35868726720. Its totient is φ = 16439832992.

The previous prime is 25780647251. The next prime is 25780647311. The reversal of 25780647261 is 16274608752.

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 25780647261 - 2⁷ = 25780647133 is a prime.

It is a super-2 number, since 2×25780647261² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25780647261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25780647241) 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, 186816216 + ... + 186816353.

It is an arithmetic number, because the mean of its divisors is an integer number (4483590840).

Almost surely, 2^25780647261 is an apocalyptic number.

It is an amenable number.

25780647261 is a deficient number, since it is larger than the sum of its proper divisors (10088079459).

25780647261 is a wasteful number, since it uses less digits than its factorization.

25780647261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373632595.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 25780647261 in words is "twenty-five billion, seven hundred eighty million, six hundred forty-seven thousand, two hundred sixty-one".