25506659999999 has 4 divisors (see below), whose sum is σ = 26049354893664. Its totient is φ = 24963965106336.

The previous prime is 25506659999959. The next prime is 25506660000023. The reversal of 25506659999999 is 99999995660552.

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

It is a cyclic number.

It is not a de Polignac number, because 25506659999999 - 2¹⁶ = 25506659934463 is a prime.

It is a Duffinian number.

25506659999999 is a modest number, since divided by 9999999 gives 2550665 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25506659999959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271347446762 + ... + 271347446855.

It is an arithmetic number, because the mean of its divisors is an integer number (6512338723416).

Almost surely, 2^{25506659999999} is an apocalyptic number.

25506659999999 is a deficient number, since it is larger than the sum of its proper divisors (542694893665).

25506659999999 is an equidigital number, since it uses as much as digits as its factorization.

25506659999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542694893664.

The product of its (nonzero) digits is 43046721000, while the sum is 92.

The spelling of 25506659999999 in words is "twenty-five trillion, five hundred six billion, six hundred fifty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".