68737783777 has 4 divisors (see below), whose sum is σ = 74025305620. Its totient is φ = 63450261936.

The previous prime is 68737783747. The next prime is 68737783781. The reversal of 68737783777 is 77738773786.

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 3062958336 + 65674825441 = 55344^2 + 256271^2 .

It is a cyclic number.

It is not a de Polignac number, because 68737783777 - 2⁷ = 68737783649 is a prime.

It is a super-3 number, since 3×68737783777³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68737783717) 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, 2643760902 + ... + 2643760927.

It is an arithmetic number, because the mean of its divisors is an integer number (18506326405).

Almost surely, 2^68737783777 is an apocalyptic number.

It is an amenable number.

68737783777 is a deficient number, since it is larger than the sum of its proper divisors (5287521843).

68737783777 is a wasteful number, since it uses less digits than its factorization.

68737783777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287521842.

The product of its digits is 406594944, while the sum is 70.

Subtracting 68737783777 from its reverse (77738773786), we obtain a palindrome (9000990009).

The spelling of 68737783777 in words is "sixty-eight billion, seven hundred thirty-seven million, seven hundred eighty-three thousand, seven hundred seventy-seven".