25457043539661 has 4 divisors (see below), whose sum is σ = 33942724719552. Its totient is φ = 16971362359772.

The previous prime is 25457043539659. The next prime is 25457043539687. The reversal of 25457043539661 is 16693534075452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25457043539661 - 2¹ = 25457043539659 is a prime.

It is a super-2 number, since 2×25457043539661² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25457043539595 and 25457043539604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25457043639661) 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, 4242840589941 + ... + 4242840589946.

It is an arithmetic number, because the mean of its divisors is an integer number (8485681179888).

Almost surely, 2^{25457043539661} is an apocalyptic number.

It is an amenable number.

25457043539661 is a deficient number, since it is larger than the sum of its proper divisors (8485681179891).

25457043539661 is an equidigital number, since it uses as much as digits as its factorization.

25457043539661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485681179890.

The product of its (nonzero) digits is 81648000, while the sum is 60.

The spelling of 25457043539661 in words is "twenty-five trillion, four hundred fifty-seven billion, forty-three million, five hundred thirty-nine thousand, six hundred sixty-one".