25789576643 has 16 divisors (see below), whose sum is σ = 27360072000. Its totient is φ = 24259804800.

The previous prime is 25789576639. The next prime is 25789576649. The reversal of 25789576643 is 34667598752.

It is a cyclic number.

It is not a de Polignac number, because 25789576643 - 2² = 25789576639 is a prime.

It is a super-2 number, since 2×25789576643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25789576649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308873 + ... + 383381.

It is an arithmetic number, because the mean of its divisors is an integer number (1710004500).

Almost surely, 2^25789576643 is an apocalyptic number.

25789576643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25789576643 is a deficient number, since it is larger than the sum of its proper divisors (1570495357).

25789576643 is a wasteful number, since it uses less digits than its factorization.

25789576643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74782.

The product of its digits is 76204800, while the sum is 62.

The spelling of 25789576643 in words is "twenty-five billion, seven hundred eighty-nine million, five hundred seventy-six thousand, six hundred forty-three".