25505530251 has 8 divisors (see below), whose sum is σ = 35797235520. Its totient is φ = 16108755912.

The previous prime is 25505530249. The next prime is 25505530273. The reversal of 25505530251 is 15203550552.

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

It is not a de Polignac number, because 25505530251 - 2¹ = 25505530249 is a prime.

It is a super-2 number, since 2×25505530251² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25505530651) 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, 223732665 + ... + 223732778.

It is an arithmetic number, because the mean of its divisors is an integer number (4474654440).

Almost surely, 2^25505530251 is an apocalyptic number.

25505530251 is a deficient number, since it is larger than the sum of its proper divisors (10291705269).

25505530251 is a wasteful number, since it uses less digits than its factorization.

25505530251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447465465.

The product of its (nonzero) digits is 37500, while the sum is 33.

It can be divided in two parts, 2550 and 5530251, that added together give a triangular number (5532801 = T₃₃₂₆).

The spelling of 25505530251 in words is "twenty-five billion, five hundred five million, five hundred thirty thousand, two hundred fifty-one".