25771297446 has 64 divisors (see below), whose sum is σ = 58927627200. Its totient is φ = 8449518240.

The previous prime is 25771297421. The next prime is 25771297481. The reversal of 25771297446 is 64479217752.

25771297446 is a `hidden beast` number, since 2 + 5 + 77 + 129 + 7 + 446 = 666.

It is a super-2 number, since 2×25771297446² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 25771297392 and 25771297401.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 218520 + ... + 315108.

It is an arithmetic number, because the mean of its divisors is an integer number (920744175).

Almost surely, 2^25771297446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25771297446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29463813600).

25771297446 is an abundant number, since it is smaller than the sum of its proper divisors (33156329754).

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

25771297446 is an frugal number, since it uses more digits than its factorization.

25771297446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96673 (or 96655 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 54.

The spelling of 25771297446 in words is "twenty-five billion, seven hundred seventy-one million, two hundred ninety-seven thousand, four hundred forty-six".