25791556434 has 64 divisors (see below), whose sum is σ = 60408505344. Its totient is φ = 7187455296.

The previous prime is 25791556433. The next prime is 25791556451. The reversal of 25791556434 is 43465519752.

It is not an unprimeable number, because it can be changed into a prime (25791556433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1314057 + ... + 1333539.

It is an arithmetic number, because the mean of its divisors is an integer number (943882896).

Almost surely, 2^25791556434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25791556434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30204252672).

25791556434 is an abundant number, since it is smaller than the sum of its proper divisors (34616948910).

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

25791556434 is a wasteful number, since it uses less digits than its factorization.

25791556434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20271.

The product of its digits is 4536000, while the sum is 51.

The spelling of 25791556434 in words is "twenty-five billion, seven hundred ninety-one million, five hundred fifty-six thousand, four hundred thirty-four".