25006645456 has 20 divisors (see below), whose sum is σ = 52177327972. Its totient is φ = 11541528576.

The previous prime is 25006645453. The next prime is 25006645457. The reversal of 25006645456 is 65454660052.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4717491856 + 20289153600 = 68684^2 + 142440^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25006645453) 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 3 ways as a sum of consecutive naturals, for example, 60111921 + ... + 60112336.

Almost surely, 2^25006645456 is an apocalyptic number.

25006645456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25006645456 is an abundant number, since it is smaller than the sum of its proper divisors (27170682516).

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

25006645456 is a wasteful number, since it uses less digits than its factorization.

25006645456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120224278 (or 120224272 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 25006645456 in words is "twenty-five billion, six million, six hundred forty-five thousand, four hundred fifty-six".