25762678821 has 36 divisors (see below), whose sum is σ = 41079234924. Its totient is φ = 15546579840.

The previous prime is 25762678813. The next prime is 25762678831. The reversal of 25762678821 is 12887626752.

25762678821 is a `hidden beast` number, since 2 + 5 + 7 + 626 + 7 + 8 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3759406596 + 22003272225 = 61314^2 + 148335^2 .

It is not a de Polignac number, because 25762678821 - 2³ = 25762678813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25762678831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 202971 + ... + 304503.

It is an arithmetic number, because the mean of its divisors is an integer number (1141089859).

Almost surely, 2^25762678821 is an apocalyptic number.

It is an amenable number.

25762678821 is a deficient number, since it is larger than the sum of its proper divisors (15316556103).

25762678821 is a wasteful number, since it uses less digits than its factorization.

25762678821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101794 (or 101780 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 25762678821 in words is "twenty-five billion, seven hundred sixty-two million, six hundred seventy-eight thousand, eight hundred twenty-one".