68136811405 has 8 divisors (see below), whose sum is σ = 88053725592. Its totient is φ = 50316414528.

The previous prime is 68136811399. The next prime is 68136811417. The reversal of 68136811405 is 50411863186.

It can be written as a sum of positive squares in 4 ways, for example, as 15671534596 + 52465276809 = 125186^2 + 229053^2 .

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 68136811405 - 2³ = 68136811397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524129254 + ... + 524129383.

It is an arithmetic number, because the mean of its divisors is an integer number (11006715699).

Almost surely, 2^68136811405 is an apocalyptic number.

68136811405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68136811405 is a deficient number, since it is larger than the sum of its proper divisors (19916914187).

68136811405 is a wasteful number, since it uses less digits than its factorization.

68136811405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048258655.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 68136811405 in words is "sixty-eight billion, one hundred thirty-six million, eight hundred eleven thousand, four hundred five".