68721768783 has 6 divisors (see below), whose sum is σ = 99264777144. Its totient is φ = 45814512516.

The previous prime is 68721768769. The next prime is 68721768809. The reversal of 68721768783 is 38786712786.

It is not a de Polignac number, because 68721768783 - 2¹² = 68721764687 is a prime.

It is a super-2 number, since 2×68721768783² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68721768783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68721763783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3817876035 + ... + 3817876052.

It is an arithmetic number, because the mean of its divisors is an integer number (16544129524).

Almost surely, 2^68721768783 is an apocalyptic number.

68721768783 is a deficient number, since it is larger than the sum of its proper divisors (30543008361).

68721768783 is a wasteful number, since it uses less digits than its factorization.

68721768783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7635752093 (or 7635752090 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The spelling of 68721768783 in words is "sixty-eight billion, seven hundred twenty-one million, seven hundred sixty-eight thousand, seven hundred eighty-three".