25663844468451 has 16 divisors (see below), whose sum is σ = 39690494361344. Its totient is φ = 14446172578464.

The previous prime is 25663844468429. The next prime is 25663844468497. The reversal of 25663844468451 is 15486444836652.

It is not a de Polignac number, because 25663844468451 - 2¹⁰ = 25663844467427 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25663844468851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9120057040 + ... + 9120059853.

It is an arithmetic number, because the mean of its divisors is an integer number (2480655897584).

Almost surely, 2^{25663844468451} is an apocalyptic number.

25663844468451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25663844468451 is a deficient number, since it is larger than the sum of its proper divisors (14026649892893).

25663844468451 is a wasteful number, since it uses less digits than its factorization.

25663844468451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18240116970.

The product of its digits is 530841600, while the sum is 66.

The spelling of 25663844468451 in words is "twenty-five trillion, six hundred sixty-three billion, eight hundred forty-four million, four hundred sixty-eight thousand, four hundred fifty-one".