25729280643 has 18 divisors (see below), whose sum is σ = 37712405892. Its totient is φ = 15591651240.

The previous prime is 25729280593. The next prime is 25729280651. The reversal of 25729280643 is 34608292752.

It is not a de Polignac number, because 25729280643 - 2⁸ = 25729280387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25729280592 and 25729280601.

It is not an unprimeable number, because it can be changed into a prime (25729282643) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3051888 + ... + 3060306.

Almost surely, 2^25729280643 is an apocalyptic number.

25729280643 is a deficient number, since it is larger than the sum of its proper divisors (11983125249).

25729280643 is an frugal number, since it uses more digits than its factorization.

25729280643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16863 (or 8433 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

Multiplying 25729280643 by its sum of digits (48), we get a square (1235005470864 = 1111308²).

The spelling of 25729280643 in words is "twenty-five billion, seven hundred twenty-nine million, two hundred eighty thousand, six hundred forty-three".