25506659999989 has 8 divisors (see below), whose sum is σ = 29178742555008. Its totient is φ = 21841645940880.

The previous prime is 25506659999959. The next prime is 25506660000023. The reversal of 25506659999989 is 98999995660552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25506659999989 - 2³⁵ = 25472300261621 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 1767116242 + ... + 1767130675.

It is an arithmetic number, because the mean of its divisors is an integer number (3647342819376).

Almost surely, 2^{25506659999989} is an apocalyptic number.

It is an amenable number.

25506659999989 is a deficient number, since it is larger than the sum of its proper divisors (3672082555019).

25506659999989 is a wasteful number, since it uses less digits than its factorization.

25506659999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534247955.

The product of its (nonzero) digits is 38263752000, while the sum is 91.

The spelling of 25506659999989 in words is "twenty-five trillion, five hundred six billion, six hundred fifty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".