25551623441 has 4 divisors (see below), whose sum is σ = 27054660132. Its totient is φ = 24048586752.

The previous prime is 25551623389. The next prime is 25551623483. The reversal of 25551623441 is 14432615552.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11437233025 + 14114390416 = 106945^2 + 118804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25551623441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25551623395 and 25551623404.

It is not an unprimeable number, because it can be changed into a prime (25551623341) 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, 751518320 + ... + 751518353.

It is an arithmetic number, because the mean of its divisors is an integer number (6763665033).

Almost surely, 2^25551623441 is an apocalyptic number.

It is an amenable number.

25551623441 is a deficient number, since it is larger than the sum of its proper divisors (1503036691).

25551623441 is a wasteful number, since it uses less digits than its factorization.

25551623441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503036690.

The product of its digits is 144000, while the sum is 38.

The spelling of 25551623441 in words is "twenty-five billion, five hundred fifty-one million, six hundred twenty-three thousand, four hundred forty-one".