68686721695811 has 8 divisors (see below), whose sum is σ = 72302022170880. Its totient is φ = 65071442206728.

The previous prime is 68686721695783. The next prime is 68686721695817. The reversal of 68686721695811 is 11859612768686.

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 68686721695811 - 2⁶ = 68686721695747 is a prime.

It is a super-2 number, since 2×68686721695811² (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 (68686721695817) 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, 1708130 + ... + 11844456.

It is an arithmetic number, because the mean of its divisors is an integer number (9037752771360).

Almost surely, 2^{68686721695811} is an apocalyptic number.

68686721695811 is a deficient number, since it is larger than the sum of its proper divisors (3615300475069).

68686721695811 is a wasteful number, since it uses less digits than its factorization.

68686721695811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10492993.

The product of its digits is 418037760, while the sum is 74.

The spelling of 68686721695811 in words is "sixty-eight trillion, six hundred eighty-six billion, seven hundred twenty-one million, six hundred ninety-five thousand, eight hundred eleven".