25661252503 has 8 divisors (see below), whose sum is σ = 27015937920. Its totient is φ = 24306976440.

The previous prime is 25661252501. The next prime is 25661252543. The reversal of 25661252503 is 30525216652.

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

It is a cyclic number.

It is not a de Polignac number, because 25661252503 - 2¹ = 25661252501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661252501) 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, 30798 + ... + 228628.

It is an arithmetic number, because the mean of its divisors is an integer number (3376992240).

Almost surely, 2^25661252503 is an apocalyptic number.

25661252503 is a deficient number, since it is larger than the sum of its proper divisors (1354685417).

25661252503 is a wasteful number, since it uses less digits than its factorization.

25661252503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204677.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 25661252503 in words is "twenty-five billion, six hundred sixty-one million, two hundred fifty-two thousand, five hundred three".