25641511263 has 6 divisors (see below), whose sum is σ = 37037738504. Its totient is φ = 17094340836.

The previous prime is 25641511261. The next prime is 25641511279. The reversal of 25641511263 is 36211514652.

25641511263 is a `hidden beast` number, since 2 + 5 + 641 + 5 + 1 + 1 + 2 + 6 + 3 = 666.

It is not a de Polignac number, because 25641511263 - 2¹ = 25641511261 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 (25641511261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1424528395 + ... + 1424528412.

Almost surely, 2^25641511263 is an apocalyptic number.

25641511263 is a deficient number, since it is larger than the sum of its proper divisors (11396227241).

25641511263 is a wasteful number, since it uses less digits than its factorization.

25641511263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849056813 (or 2849056810 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 25641511263 in words is "twenty-five billion, six hundred forty-one million, five hundred eleven thousand, two hundred sixty-three".