25456660993 has 4 divisors (see below), whose sum is σ = 25467745860. Its totient is φ = 25445576128.

The previous prime is 25456660969. The next prime is 25456661017. The reversal of 25456660993 is 39906665452.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25456660969) and next prime (25456661017).

It can be written as a sum of positive squares in 2 ways, for example, as 15550838209 + 9905822784 = 124703^2 + 99528^2 .

It is a cyclic number.

It is not a de Polignac number, because 25456660993 - 2⁵ = 25456660961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25456663993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5538988 + ... + 5543581.

It is an arithmetic number, because the mean of its divisors is an integer number (6366936465).

Almost surely, 2^25456660993 is an apocalyptic number.

It is an amenable number.

25456660993 is a deficient number, since it is larger than the sum of its proper divisors (11084867).

25456660993 is a wasteful number, since it uses less digits than its factorization.

25456660993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11084866.

The product of its (nonzero) digits is 10497600, while the sum is 55.

The spelling of 25456660993 in words is "twenty-five billion, four hundred fifty-six million, six hundred sixty thousand, nine hundred ninety-three".