25345533551 has 4 divisors (see below), whose sum is σ = 27295189992. Its totient is φ = 23395877112.

The previous prime is 25345533539. The next prime is 25345533557. The reversal of 25345533551 is 15533554352.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25345533551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25345533499 and 25345533508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25345533557) 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, 974828201 + ... + 974828226.

It is an arithmetic number, because the mean of its divisors is an integer number (6823797498).

Almost surely, 2^25345533551 is an apocalyptic number.

25345533551 is a deficient number, since it is larger than the sum of its proper divisors (1949656441).

25345533551 is a wasteful number, since it uses less digits than its factorization.

25345533551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949656440.

The product of its digits is 675000, while the sum is 41.

The spelling of 25345533551 in words is "twenty-five billion, three hundred forty-five million, five hundred thirty-three thousand, five hundred fifty-one".