677786867721 has 8 divisors (see below), whose sum is σ = 1004128692960. Its totient is φ = 451857911796.

The previous prime is 677786867707. The next prime is 677786867783. The reversal of 677786867721 is 127768687776.

It is not a de Polignac number, because 677786867721 - 2¹⁴ = 677786851337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 677786867721.

It is not an unprimeable number, because it can be changed into a prime (677786867701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12551608635 + ... + 12551608688.

It is an arithmetic number, because the mean of its divisors is an integer number (125516086620).

Almost surely, 2^677786867721 is an apocalyptic number.

It is an amenable number.

677786867721 is a deficient number, since it is larger than the sum of its proper divisors (326341825239).

677786867721 is a wasteful number, since it uses less digits than its factorization.

677786867721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25103217332 (or 25103217326 counting only the distinct ones).

The product of its digits is 464679936, while the sum is 72.

The spelling of 677786867721 in words is "six hundred seventy-seven billion, seven hundred eighty-six million, eight hundred sixty-seven thousand, seven hundred twenty-one".