25106352640 has 80 divisors (see below), whose sum is σ = 60244224480. Its totient is φ = 10034565120.

The previous prime is 25106352637. The next prime is 25106352653. The reversal of 25106352640 is 4625360152.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 25106352596 and 25106352605.

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 7 ways as a sum of consecutive naturals, for example, 4039135 + ... + 4045345.

It is an arithmetic number, because the mean of its divisors is an integer number (753052806).

Almost surely, 2^25106352640 is an apocalyptic number.

25106352640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25106352640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30122112240).

25106352640 is an abundant number, since it is smaller than the sum of its proper divisors (35137871840).

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

25106352640 is an equidigital number, since it uses as much as digits as its factorization.

25106352640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7813 (or 7797 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 25106352640 in words is "twenty-five billion, one hundred six million, three hundred fifty-two thousand, six hundred forty".