25728506811 has 12 divisors (see below), whose sum is σ = 42472455792. Its totient is φ = 14702003856.

The previous prime is 25728506807. The next prime is 25728506831. The reversal of 25728506811 is 11860582752.

25728506811 is a `hidden beast` number, since 2 + 572 + 8 + 5 + 0 + 68 + 11 = 666.

It is not a de Polignac number, because 25728506811 - 2² = 25728506807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25728506831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204194436 + ... + 204194561.

It is an arithmetic number, because the mean of its divisors is an integer number (3539371316).

Almost surely, 2^25728506811 is an apocalyptic number.

25728506811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25728506811 is a deficient number, since it is larger than the sum of its proper divisors (16743948981).

25728506811 is a wasteful number, since it uses less digits than its factorization.

25728506811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408389010 (or 408389007 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 25728506811 in words is "twenty-five billion, seven hundred twenty-eight million, five hundred six thousand, eight hundred eleven".