25787749017081 has 8 divisors (see below), whose sum is σ = 34383728473920. Its totient is φ = 17191801119152.

The previous prime is 25787749017071. The next prime is 25787749017101. The reversal of 25787749017081 is 18071094778752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25787749017081 is a prime.

It is a super-2 number, since 2×25787749017081² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25787749017071) 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, 5912286 + ... + 9302183.

It is an arithmetic number, because the mean of its divisors is an integer number (4297966059240).

Almost surely, 2^{25787749017081} is an apocalyptic number.

It is an amenable number.

25787749017081 is a deficient number, since it is larger than the sum of its proper divisors (8595979456839).

25787749017081 is a wasteful number, since it uses less digits than its factorization.

25787749017081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15779455.

The product of its (nonzero) digits is 55319040, while the sum is 66.

The spelling of 25787749017081 in words is "twenty-five trillion, seven hundred eighty-seven billion, seven hundred forty-nine million, seventeen thousand, eighty-one".