681255677 has 4 divisors (see below), whose sum is σ = 685767456. Its totient is φ = 676743900.

The previous prime is 681255661. The next prime is 681255683. The reversal of 681255677 is 776552186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681255677 - 2⁴ = 681255661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681255277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255663 + ... + 2255964.

It is an arithmetic number, because the mean of its divisors is an integer number (171441864).

Almost surely, 2^681255677 is an apocalyptic number.

It is an amenable number.

681255677 is a deficient number, since it is larger than the sum of its proper divisors (4511779).

681255677 is a wasteful number, since it uses less digits than its factorization.

681255677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511778.

The product of its digits is 705600, while the sum is 47.

The square root of 681255677 is about 26100.8750236462. The cubic root of 681255677 is about 879.9068759067.

The spelling of 681255677 in words is "six hundred eighty-one million, two hundred fifty-five thousand, six hundred seventy-seven".