68737783778 has 4 divisors (see below), whose sum is σ = 103106675670. Its totient is φ = 34368891888.

The previous prime is 68737783747. The next prime is 68737783781. The reversal of 68737783778 is 87738773786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66153383209 + 2584400569 = 257203^2 + 50837^2 .

It is a super-3 number, since 3×68737783778³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17184445943 + ... + 17184445946.

Almost surely, 2^68737783778 is an apocalyptic number.

68737783778 is a deficient number, since it is larger than the sum of its proper divisors (34368891892).

68737783778 is a wasteful number, since it uses less digits than its factorization.

68737783778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34368891891.

The product of its digits is 464679936, while the sum is 71.

The spelling of 68737783778 in words is "sixty-eight billion, seven hundred thirty-seven million, seven hundred eighty-three thousand, seven hundred seventy-eight".