68657744077 has 6 divisors (see below), whose sum is σ = 73940126442. Its totient is φ = 63375507072.

The previous prime is 68657744069. The next prime is 68657744123. The reversal of 68657744077 is 77044775686.

It can be written as a sum of positive squares in 3 ways, for example, as 1708251561 + 66949492516 = 41331^2 + 258746^2 .

It is not a de Polignac number, because 68657744077 - 2³ = 68657744069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68657742077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 908413 + ... + 981085.

It is an arithmetic number, because the mean of its divisors is an integer number (12323354407).

Almost surely, 2^68657744077 is an apocalyptic number.

It is an amenable number.

68657744077 is a deficient number, since it is larger than the sum of its proper divisors (5282382365).

68657744077 is an frugal number, since it uses more digits than its factorization.

68657744077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145359 (or 72686 counting only the distinct ones).

The product of its (nonzero) digits is 55319040, while the sum is 61.

The spelling of 68657744077 in words is "sixty-eight billion, six hundred fifty-seven million, seven hundred forty-four thousand, seventy-seven".