681555258 has 12 divisors (see below), whose sum is σ = 1476703098. Its totient is φ = 227185080.

The previous prime is 681555253. The next prime is 681555283. The reversal of 681555258 is 852555186.

It can be written as a sum of positive squares in only one way, i.e., 599417289 + 82137969 = 24483^2 + 9063^2 .

It is not an unprimeable number, because it can be changed into a prime (681555253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18932073 + ... + 18932108.

Almost surely, 2^681555258 is an apocalyptic number.

681555258 is an abundant number, since it is smaller than the sum of its proper divisors (795147840).

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

681555258 is a wasteful number, since it uses less digits than its factorization.

681555258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37864189 (or 37864186 counting only the distinct ones).

The product of its digits is 480000, while the sum is 45.

The square root of 681555258 is about 26106.6133000816. The cubic root of 681555258 is about 880.0358361784.

The spelling of 681555258 in words is "six hundred eighty-one million, five hundred fifty-five thousand, two hundred fifty-eight".