68842661971 has 4 divisors (see below), whose sum is σ = 68843743992. Its totient is φ = 68841579952.

The previous prime is 68842661957. The next prime is 68842661999. The reversal of 68842661971 is 17916624886.

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

It is a cyclic number.

It is not a de Polignac number, because 68842661971 - 2¹¹ = 68842659923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68842631971) 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, 439186 + ... + 574951.

It is an arithmetic number, because the mean of its divisors is an integer number (17210935998).

Almost surely, 2^68842661971 is an apocalyptic number.

68842661971 is a deficient number, since it is larger than the sum of its proper divisors (1082021).

68842661971 is a wasteful number, since it uses less digits than its factorization.

68842661971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082020.

The product of its digits is 6967296, while the sum is 58.

The spelling of 68842661971 in words is "sixty-eight billion, eight hundred forty-two million, six hundred sixty-one thousand, nine hundred seventy-one".