25621394782 has 8 divisors (see below), whose sum is σ = 38734707456. Its totient is φ = 12709825632.

The previous prime is 25621394767. The next prime is 25621394783. The reversal of 25621394782 is 28749312652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25621394783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50435563 + ... + 50436070.

It is an arithmetic number, because the mean of its divisors is an integer number (4841838432).

Almost surely, 2^25621394782 is an apocalyptic number.

25621394782 is a deficient number, since it is larger than the sum of its proper divisors (13113312674).

25621394782 is a wasteful number, since it uses less digits than its factorization.

25621394782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100871762.

The product of its digits is 1451520, while the sum is 49.

The spelling of 25621394782 in words is "twenty-five billion, six hundred twenty-one million, three hundred ninety-four thousand, seven hundred eighty-two".