26257687643 has 6 divisors (see below), whose sum is σ = 28861755972. Its totient is φ = 23870625020.

The previous prime is 26257687609. The next prime is 26257687727. The reversal of 26257687643 is 34678675262.

It is not a de Polignac number, because 26257687643 - 2¹⁶ = 26257622107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26257687343) 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, 108502721 + ... + 108502962.

It is an arithmetic number, because the mean of its divisors is an integer number (4810292662).

Almost surely, 2^26257687643 is an apocalyptic number.

26257687643 is a deficient number, since it is larger than the sum of its proper divisors (2604068329).

26257687643 is a wasteful number, since it uses less digits than its factorization.

26257687643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217005705 (or 217005694 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 56.

The spelling of 26257687643 in words is "twenty-six billion, two hundred fifty-seven million, six hundred eighty-seven thousand, six hundred forty-three".