25971561524 has 6 divisors (see below), whose sum is σ = 45450232674. Its totient is φ = 12985780760.

The previous prime is 25971561461. The next prime is 25971561547. The reversal of 25971561524 is 42516517952.

It can be written as a sum of positive squares in only one way, i.e., 16246051600 + 9725509924 = 127460^2 + 98618^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3246445187 + ... + 3246445194.

It is an arithmetic number, because the mean of its divisors is an integer number (7575038779).

Almost surely, 2^25971561524 is an apocalyptic number.

It is an amenable number.

25971561524 is a deficient number, since it is larger than the sum of its proper divisors (19478671150).

25971561524 is a wasteful number, since it uses less digits than its factorization.

25971561524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6492890385 (or 6492890383 counting only the distinct ones).

The product of its digits is 756000, while the sum is 47.

The spelling of 25971561524 in words is "twenty-five billion, nine hundred seventy-one million, five hundred sixty-one thousand, five hundred twenty-four".