25397139854 has 16 divisors (see below), whose sum is σ = 39061748448. Its totient is φ = 12379609632.

The previous prime is 25397139827. The next prime is 25397139869. The reversal of 25397139854 is 45893179352.

It is a self number, because there is not a number n which added to its sum of digits gives 25397139854.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 746402 + ... + 779685.

It is an arithmetic number, because the mean of its divisors is an integer number (2441359278).

Almost surely, 2^25397139854 is an apocalyptic number.

25397139854 is a deficient number, since it is larger than the sum of its proper divisors (13664608594).

25397139854 is a wasteful number, since it uses less digits than its factorization.

25397139854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526299.

The product of its digits is 8164800, while the sum is 56.

The spelling of 25397139854 in words is "twenty-five billion, three hundred ninety-seven million, one hundred thirty-nine thousand, eight hundred fifty-four".