68277777813 has 36 divisors (see below), whose sum is σ = 116606033388. Its totient is φ = 38376253440.

The previous prime is 68277777787. The next prime is 68277777833. The reversal of 68277777813 is 31877777286.

It can be written as a sum of positive squares in 2 ways, for example, as 1537188849 + 66740588964 = 39207^2 + 258342^2 .

It is not a de Polignac number, because 68277777813 - 2⁵ = 68277777781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68277777833) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1242156 + ... + 1295957.

It is an arithmetic number, because the mean of its divisors is an integer number (3239056483).

Almost surely, 2^68277777813 is an apocalyptic number.

68277777813 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

68277777813 is a deficient number, since it is larger than the sum of its proper divisors (48328255575).

68277777813 is a wasteful number, since it uses less digits than its factorization.

68277777813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538194 (or 2538184 counting only the distinct ones).

The product of its digits is 38723328, while the sum is 63.

The spelling of 68277777813 in words is "sixty-eight billion, two hundred seventy-seven million, seven hundred seventy-seven thousand, eight hundred thirteen".