25646145451 has 4 divisors (see below), whose sum is σ = 26995942600. Its totient is φ = 24296348304.

The previous prime is 25646145449. The next prime is 25646145457. The reversal of 25646145451 is 15454164652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25646145451 - 2¹ = 25646145449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25646145398 and 25646145407.

It is not an unprimeable number, because it can be changed into a prime (25646145457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674898546 + ... + 674898583.

It is an arithmetic number, because the mean of its divisors is an integer number (6748985650).

Almost surely, 2^25646145451 is an apocalyptic number.

25646145451 is a deficient number, since it is larger than the sum of its proper divisors (1349797149).

25646145451 is a wasteful number, since it uses less digits than its factorization.

25646145451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349797148.

The product of its digits is 576000, while the sum is 43.

The spelling of 25646145451 in words is "twenty-five billion, six hundred forty-six million, one hundred forty-five thousand, four hundred fifty-one".