25761561983 has 4 divisors (see below), whose sum is σ = 27276948000. Its totient is φ = 24246175968.

The previous prime is 25761561923. The next prime is 25761561989. The reversal of 25761561983 is 38916516752.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25761561983 - 2¹⁰ = 25761560959 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 (25761561989) 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, 757692983 + ... + 757693016.

It is an arithmetic number, because the mean of its divisors is an integer number (6819237000).

Almost surely, 2^25761561983 is an apocalyptic number.

25761561983 is a deficient number, since it is larger than the sum of its proper divisors (1515386017).

25761561983 is a wasteful number, since it uses less digits than its factorization.

25761561983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515386016.

The product of its digits is 2721600, while the sum is 53.

The spelling of 25761561983 in words is "twenty-five billion, seven hundred sixty-one million, five hundred sixty-one thousand, nine hundred eighty-three".