257833040840 has 16 divisors (see below), whose sum is σ = 580124341980. Its totient is φ = 103133216320.

The previous prime is 257833040749. The next prime is 257833040867. The reversal of 257833040840 is 48040338752.

It can be written as a sum of positive squares in 2 ways, for example, as 244967583364 + 12865457476 = 494942^2 + 113426^2 .

It is a super-2 number, since 2×257833040840² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257833040791 and 257833040800.

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, 3222912971 + ... + 3222913050.

Almost surely, 2^257833040840 is an apocalyptic number.

257833040840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257833040840 is an abundant number, since it is smaller than the sum of its proper divisors (322291301140).

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

257833040840 is a wasteful number, since it uses less digits than its factorization.

257833040840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445826032 (or 6445826028 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 257833040840 in words is "two hundred fifty-seven billion, eight hundred thirty-three million, forty thousand, eight hundred forty".