25664620052 has 6 divisors (see below), whose sum is σ = 44913085098. Its totient is φ = 12832310024.

The previous prime is 25664620019. The next prime is 25664620073. The reversal of 25664620052 is 25002646652.

It can be written as a sum of positive squares in only one way, i.e., 17238114436 + 8426505616 = 131294^2 + 91796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25664619988 and 25664620015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3208077503 + ... + 3208077510.

It is an arithmetic number, because the mean of its divisors is an integer number (7485514183).

Almost surely, 2^25664620052 is an apocalyptic number.

It is an amenable number.

25664620052 is a deficient number, since it is larger than the sum of its proper divisors (19248465046).

25664620052 is a wasteful number, since it uses less digits than its factorization.

25664620052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416155017 (or 6416155015 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 25664620052 in words is "twenty-five billion, six hundred sixty-four million, six hundred twenty thousand, fifty-two".