677491318381 has 4 divisors (see below), whose sum is σ = 717343748892. Its totient is φ = 637638887872.

The previous prime is 677491318379. The next prime is 677491318391. The reversal of 677491318381 is 183813194776.

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 523175909481 + 154315408900 = 723309^2 + 392830^2 .

It is a cyclic number.

It is not a de Polignac number, because 677491318381 - 2¹ = 677491318379 is a prime.

It is a super-2 number, since 2×677491318381² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677491318331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19926215230 + ... + 19926215263.

It is an arithmetic number, because the mean of its divisors is an integer number (179335937223).

Almost surely, 2^677491318381 is an apocalyptic number.

It is an amenable number.

677491318381 is a deficient number, since it is larger than the sum of its proper divisors (39852430511).

677491318381 is a wasteful number, since it uses less digits than its factorization.

677491318381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39852430510.

The product of its digits is 6096384, while the sum is 58.

The spelling of 677491318381 in words is "six hundred seventy-seven billion, four hundred ninety-one million, three hundred eighteen thousand, three hundred eighty-one".