25785861654 has 32 divisors (see below), whose sum is σ = 59010460416. Its totient is φ = 7358470560.

The previous prime is 25785861653. The next prime is 25785861701. The reversal of 25785861654 is 45616858752.

It is a super-2 number, since 2×25785861654² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25785861594 and 25785861603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25785861653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336457 + ... + 405924.

It is an arithmetic number, because the mean of its divisors is an integer number (1844076888).

Almost surely, 2^25785861654 is an apocalyptic number.

25785861654 is an abundant number, since it is smaller than the sum of its proper divisors (33224598762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25785861654 is a wasteful number, since it uses less digits than its factorization.

25785861654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743220.

The product of its digits is 16128000, while the sum is 57.

The spelling of 25785861654 in words is "twenty-five billion, seven hundred eighty-five million, eight hundred sixty-one thousand, six hundred fifty-four".