68722761655 has 8 divisors (see below), whose sum is σ = 82482322032. Its totient is φ = 54968203968.

The previous prime is 68722761643. The next prime is 68722761659. The reversal of 68722761655 is 55616722786.

It is a happy number.

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 68722761655 - 2²¹ = 68720664503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68722761596 and 68722761605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68722761659) 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, 1220382 + ... + 1275451.

It is an arithmetic number, because the mean of its divisors is an integer number (10310290254).

Almost surely, 2^68722761655 is an apocalyptic number.

68722761655 is a deficient number, since it is larger than the sum of its proper divisors (13759560377).

68722761655 is a wasteful number, since it uses less digits than its factorization.

68722761655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501345.

The product of its digits is 8467200, while the sum is 55.

The spelling of 68722761655 in words is "sixty-eight billion, seven hundred twenty-two million, seven hundred sixty-one thousand, six hundred fifty-five".