25559981779660 has 48 divisors (see below), whose sum is σ = 57161887979616. Its totient is φ = 9566959496192.

The previous prime is 25559981779583. The next prime is 25559981779693. The reversal of 25559981779660 is 6697718995552.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217214062 + ... + 217331701.

It is an arithmetic number, because the mean of its divisors is an integer number (1190872666242).

Almost surely, 2^{25559981779660} is an apocalyptic number.

25559981779660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25559981779660 is an abundant number, since it is smaller than the sum of its proper divisors (31601906199956).

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

25559981779660 is a wasteful number, since it uses less digits than its factorization.

25559981779660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434545962 (or 434545960 counting only the distinct ones).

The product of its (nonzero) digits is 2571912000, while the sum is 79.

The spelling of 25559981779660 in words is "twenty-five trillion, five hundred fifty-nine billion, nine hundred eighty-one million, seven hundred seventy-nine thousand, six hundred sixty".