677645261 has 4 divisors (see below), whose sum is σ = 683862300. Its totient is φ = 671428224.

The previous prime is 677645237. The next prime is 677645281. The reversal of 677645261 is 162546776.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 285407236 + 392238025 = 16894^2 + 19805^2 .

It is a cyclic number.

It is not a de Polignac number, because 677645261 - 2¹⁰ = 677644237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677645281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3108356 + ... + 3108573.

It is an arithmetic number, because the mean of its divisors is an integer number (170965575).

Almost surely, 2^677645261 is an apocalyptic number.

It is an amenable number.

677645261 is a deficient number, since it is larger than the sum of its proper divisors (6217039).

677645261 is a wasteful number, since it uses less digits than its factorization.

677645261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6217038.

The product of its digits is 423360, while the sum is 44.

The square root of 677645261 is about 26031.6204067284. The cubic root of 677645261 is about 878.3497226575.

The spelling of 677645261 in words is "six hundred seventy-seven million, six hundred forty-five thousand, two hundred sixty-one".