25140020634 has 12 divisors (see below), whose sum is σ = 54470044746. Its totient is φ = 8380006872.

The previous prime is 25140020623. The next prime is 25140020657. The reversal of 25140020634 is 43602004152.

25140020634 is a `hidden beast` number, since 2 + 5 + 1 + 4 + 0 + 0 + 20 + 634 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19826048025 + 5313972609 = 140805^2 + 72897^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25140020598 and 25140020607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 698333889 + ... + 698333924.

Almost surely, 2^25140020634 is an apocalyptic number.

25140020634 is an abundant number, since it is smaller than the sum of its proper divisors (29330024112).

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

25140020634 is a wasteful number, since it uses less digits than its factorization.

25140020634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396667821 (or 1396667818 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 25140020634 its reverse (43602004152), we get a palindrome (68742024786).

The spelling of 25140020634 in words is "twenty-five billion, one hundred forty million, twenty thousand, six hundred thirty-four".