25051420616 has 8 divisors (see below), whose sum is σ = 46971413670. Its totient is φ = 12525710304.

The previous prime is 25051420613. The next prime is 25051420627. The reversal of 25051420616 is 61602415052.

It can be written as a sum of positive squares in only one way, i.e., 18266603716 + 6784816900 = 135154^2 + 82370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (25051420613) by changing a digit.

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 as a sum of consecutive naturals, namely, 1565713781 + ... + 1565713796.

Almost surely, 2^25051420616 is an apocalyptic number.

It is an amenable number.

25051420616 is a deficient number, since it is larger than the sum of its proper divisors (21919993054).

25051420616 is a wasteful number, since it uses less digits than its factorization.

25051420616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131427583 (or 3131427579 counting only the distinct ones).

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

Adding to 25051420616 its reverse (61602415052), we get a palindrome (86653835668).

The spelling of 25051420616 in words is "twenty-five billion, fifty-one million, four hundred twenty thousand, six hundred sixteen".