257780025680 has 20 divisors (see below), whose sum is σ = 599338559892. Its totient is φ = 103112010240.

The previous prime is 257780025667. The next prime is 257780025709. The reversal of 257780025680 is 86520087752.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 150004388416 + 107775637264 = 387304^2 + 328292^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611125081 + ... + 1611125240.

Almost surely, 2^257780025680 is an apocalyptic number.

257780025680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257780025680 is an abundant number, since it is smaller than the sum of its proper divisors (341558534212).

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

257780025680 is a wasteful number, since it uses less digits than its factorization.

257780025680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222250334 (or 3222250328 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 257780025680 in words is "two hundred fifty-seven billion, seven hundred eighty million, twenty-five thousand, six hundred eighty".