68870187979 has 4 divisors (see below), whose sum is σ = 68935099680. Its totient is φ = 68805276280.

The previous prime is 68870187973. The next prime is 68870188067. The reversal of 68870187979 is 97978107886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68870187979 is a prime.

It is a super-2 number, since 2×68870187979² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68870187973) 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 3 ways as a sum of consecutive naturals, for example, 32454259 + ... + 32456380.

It is an arithmetic number, because the mean of its divisors is an integer number (17233774920).

Almost surely, 2^68870187979 is an apocalyptic number.

68870187979 is a deficient number, since it is larger than the sum of its proper divisors (64911701).

68870187979 is a wasteful number, since it uses less digits than its factorization.

68870187979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64911700.

The product of its (nonzero) digits is 85349376, while the sum is 70.

The spelling of 68870187979 in words is "sixty-eight billion, eight hundred seventy million, one hundred eighty-seven thousand, nine hundred seventy-nine".