68813973972977 has 4 divisors (see below), whose sum is σ = 70492363582116. Its totient is φ = 67135584363840.

The previous prime is 68813973972973. The next prime is 68813973973061. The reversal of 68813973972977 is 77927937931886.

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 3811744712161 + 65002229260816 = 1952369^2 + 8062396^2 .

It is a cyclic number.

It is not a de Polignac number, because 68813973972977 - 2² = 68813973972973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68813973972973) 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, 839194804508 + ... + 839194804589.

It is an arithmetic number, because the mean of its divisors is an integer number (17623090895529).

Almost surely, 2^{68813973972977} is an apocalyptic number.

It is an amenable number.

68813973972977 is a deficient number, since it is larger than the sum of its proper divisors (1678389609139).

68813973972977 is a wasteful number, since it uses less digits than its factorization.

68813973972977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678389609138.

The product of its digits is 12098274048, while the sum is 86.

The spelling of 68813973972977 in words is "sixty-eight trillion, eight hundred thirteen billion, nine hundred seventy-three million, nine hundred seventy-two thousand, nine hundred seventy-seven".