68669247729481 has 9 divisors (see below), whose sum is σ = 79880620958631. Its totient is φ = 58859305476552.

The previous prime is 68669247729473. The next prime is 68669247729541. The reversal of 68669247729481 is 18492774296686.

The square root of 68669247729481 is 8286691.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 54093009492025 + 14576238237456 = 7354795^2 + 3817884^2 .

It is not a de Polignac number, because 68669247729481 - 2³ = 68669247729473 is a prime.

It is a super-2 number, since 2×68669247729481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68669247726481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 57414931 + ... + 58598743.

It is an arithmetic number, because the mean of its divisors is an integer number (8875624550959).

Almost surely, 2^{68669247729481} is an apocalyptic number.

68669247729481 is the 8286691-st square number.

68669247729481 is the 4143346-th centered octagonal number.

It is an amenable number.

68669247729481 is a deficient number, since it is larger than the sum of its proper divisors (11211373229150).

68669247729481 is an frugal number, since it uses more digits than its factorization.

68669247729481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367640 (or 1183820 counting only the distinct ones).

The product of its digits is 3511517184, while the sum is 79.

The spelling of 68669247729481 in words is "sixty-eight trillion, six hundred sixty-nine billion, two hundred forty-seven million, seven hundred twenty-nine thousand, four hundred eighty-one".