68564056991 has 8 divisors (see below), whose sum is σ = 72699643440. Its totient is φ = 64439849088.

The previous prime is 68564056973. The next prime is 68564057021. The reversal of 68564056991 is 19965046586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68564056991 - 2⁶ = 68564056927 is a prime.

It is a super-3 number, since 3×68564056991³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68564056991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68564056921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2832221 + ... + 2856326.

It is an arithmetic number, because the mean of its divisors is an integer number (9087455430).

Almost surely, 2^68564056991 is an apocalyptic number.

68564056991 is a deficient number, since it is larger than the sum of its proper divisors (4135586449).

68564056991 is a wasteful number, since it uses less digits than its factorization.

68564056991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689273.

The product of its (nonzero) digits is 13996800, while the sum is 59.

The spelling of 68564056991 in words is "sixty-eight billion, five hundred sixty-four million, fifty-six thousand, nine hundred ninety-one".