25051666540 has 24 divisors (see below), whose sum is σ = 52875556272. Its totient is φ = 9969798720.

The previous prime is 25051666517. The next prime is 25051666561. The reversal of 25051666540 is 4566615052.

It is a junction number, because it is equal to n+sod(n) for n = 25051666493 and 25051666502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3175206 + ... + 3183085.

It is an arithmetic number, because the mean of its divisors is an integer number (2203148178).

Almost surely, 2^25051666540 is an apocalyptic number.

25051666540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25051666540 is an abundant number, since it is smaller than the sum of its proper divisors (27823889732).

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

25051666540 is a wasteful number, since it uses less digits than its factorization.

25051666540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6358497 (or 6358495 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 25051666540 in words is "twenty-five billion, fifty-one million, six hundred sixty-six thousand, five hundred forty".