681774577 has 4 divisors (see below), whose sum is σ = 743754096. Its totient is φ = 619795060.

The previous prime is 681774553. The next prime is 681774581. The reversal of 681774577 is 775477186.

It is a happy number.

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 681774577 - 2¹¹ = 681772529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681774517) 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, 30989743 + ... + 30989764.

It is an arithmetic number, because the mean of its divisors is an integer number (185938524).

Almost surely, 2^681774577 is an apocalyptic number.

It is an amenable number.

681774577 is a deficient number, since it is larger than the sum of its proper divisors (61979519).

681774577 is a wasteful number, since it uses less digits than its factorization.

681774577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61979518.

The product of its digits is 2304960, while the sum is 52.

The square root of 681774577 is about 26110.8134113053. The cubic root of 681774577 is about 880.1302222061.

The spelling of 681774577 in words is "six hundred eighty-one million, seven hundred seventy-four thousand, five hundred seventy-seven".