25613434206643 has 4 divisors (see below), whose sum is σ = 25747535956608. Its totient is φ = 25479332456680.

The previous prime is 25613434206631. The next prime is 25613434206667. The reversal of 25613434206643 is 34660243431652.

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 25613434206643 - 2¹⁷ = 25613434075571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25613435206643) 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, 67050874696 + ... + 67050875077.

It is an arithmetic number, because the mean of its divisors is an integer number (6436883989152).

Almost surely, 2^{25613434206643} is an apocalyptic number.

25613434206643 is a deficient number, since it is larger than the sum of its proper divisors (134101749965).

25613434206643 is a wasteful number, since it uses less digits than its factorization.

25613434206643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134101749964.

The product of its (nonzero) digits is 7464960, while the sum is 49.

The spelling of 25613434206643 in words is "twenty-five trillion, six hundred thirteen billion, four hundred thirty-four million, two hundred six thousand, six hundred forty-three".