25640520116 has 6 divisors (see below), whose sum is σ = 44870910210. Its totient is φ = 12820260056.

The previous prime is 25640520089. The next prime is 25640520137. The reversal of 25640520116 is 61102504652.

It can be written as a sum of positive squares in only one way, i.e., 17159952016 + 8480568100 = 130996^2 + 92090^2 .

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, 3205065011 + ... + 3205065018.

It is an arithmetic number, because the mean of its divisors is an integer number (7478485035).

Almost surely, 2^25640520116 is an apocalyptic number.

It is an amenable number.

25640520116 is a deficient number, since it is larger than the sum of its proper divisors (19230390094).

25640520116 is a wasteful number, since it uses less digits than its factorization.

25640520116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410130033 (or 6410130031 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 25640520116 in words is "twenty-five billion, six hundred forty million, five hundred twenty thousand, one hundred sixteen".