681475255 has 4 divisors (see below), whose sum is σ = 817770312. Its totient is φ = 545180200.

The previous prime is 681475247. The next prime is 681475271. The reversal of 681475255 is 552574186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 552574186 = 2 ⋅276287093.

It is not a de Polignac number, because 681475255 - 2³ = 681475247 is a prime.

It is a Duffinian number.

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, 68147521 + ... + 68147530.

It is an arithmetic number, because the mean of its divisors is an integer number (204442578).

Almost surely, 2^681475255 is an apocalyptic number.

681475255 is a deficient number, since it is larger than the sum of its proper divisors (136295057).

681475255 is a wasteful number, since it uses less digits than its factorization.

681475255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136295056.

The product of its digits is 336000, while the sum is 43.

The square root of 681475255 is about 26105.0810188362. The cubic root of 681475255 is about 880.0014010825.

The spelling of 681475255 in words is "six hundred eighty-one million, four hundred seventy-five thousand, two hundred fifty-five".