25784253121 has 16 divisors (see below), whose sum is σ = 28386831168. Its totient is φ = 23418669120.

The previous prime is 25784253119. The next prime is 25784253127. The reversal of 25784253121 is 12135248752.

It is not a de Polignac number, because 25784253121 - 2¹ = 25784253119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25784253127) 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, 1539625 + ... + 1556281.

It is an arithmetic number, because the mean of its divisors is an integer number (1774176948).

Almost surely, 2^25784253121 is an apocalyptic number.

It is an amenable number.

25784253121 is a deficient number, since it is larger than the sum of its proper divisors (2602578047).

25784253121 is a wasteful number, since it uses less digits than its factorization.

25784253121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17853 (or 17831 counting only the distinct ones).

The product of its digits is 134400, while the sum is 40.

The spelling of 25784253121 in words is "twenty-five billion, seven hundred eighty-four million, two hundred fifty-three thousand, one hundred twenty-one".