68687554709 has 4 divisors (see below), whose sum is σ = 68750169804. Its totient is φ = 68624939616.

The previous prime is 68687554697. The next prime is 68687554717. The reversal of 68687554709 is 90745578686.

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 10367719684 + 58319835025 = 101822^2 + 241495^2 .

It is a cyclic number.

It is not a de Polignac number, because 68687554709 - 2⁴ = 68687554693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68687554009) 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, 31305902 + ... + 31308095.

It is an arithmetic number, because the mean of its divisors is an integer number (17187542451).

Almost surely, 2^68687554709 is an apocalyptic number.

It is an amenable number.

68687554709 is a deficient number, since it is larger than the sum of its proper divisors (62615095).

68687554709 is a wasteful number, since it uses less digits than its factorization.

68687554709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62615094.

The product of its (nonzero) digits is 101606400, while the sum is 65.

The spelling of 68687554709 in words is "sixty-eight billion, six hundred eighty-seven million, five hundred fifty-four thousand, seven hundred nine".