68649443966016 has 63 divisors (see below), whose sum is σ = 196771806064821. Its totient is φ = 22883081704704.

The previous prime is 68649443965939. The next prime is 68649443966017. The reversal of 68649443966016 is 61066934494686.

It is a happy number.

The square root of 68649443966016 is 8285496.

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

68649443966016 is a `hidden beast` number, since 6 + 8 + 6 + 4 + 9 + 4 + 4 + 3 + 9 + 6 + 601 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55865100695616 + 12784343270400 = 7474296^2 + 3575520^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (68649443966017) 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, 198679290 + ... + 199024518.

Almost surely, 2^{68649443966016} is an apocalyptic number.

68649443966016 is the 8285496-th square number.

It is an amenable number.

68649443966016 is an abundant number, since it is smaller than the sum of its proper divisors (128122362098805).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68649443966016 is an frugal number, since it uses more digits than its factorization.

68649443966016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690476 (or 345234 counting only the distinct ones).

The product of its (nonzero) digits is 967458816, while the sum is 72.

The spelling of 68649443966016 in words is "sixty-eight trillion, six hundred forty-nine billion, four hundred forty-three million, nine hundred sixty-six thousand, sixteen".