68930188405 has 32 divisors (see below), whose sum is σ = 96868173024. Its totient is φ = 46613200896.

The previous prime is 68930188361. The next prime is 68930188423. The reversal of 68930188405 is 50488103986.

It can be written as a sum of positive squares in 16 ways, for example, as 39162564 + 68891025841 = 6258^2 + 262471^2 .

It is a cyclic number.

It is not a de Polignac number, because 68930188405 - 2⁷ = 68930188277 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 31 ways as a sum of consecutive naturals, for example, 802092 + ... + 883861.

It is an arithmetic number, because the mean of its divisors is an integer number (3027130407).

Almost surely, 2^68930188405 is an apocalyptic number.

68930188405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68930188405 is a deficient number, since it is larger than the sum of its proper divisors (27937984619).

68930188405 is a wasteful number, since it uses less digits than its factorization.

68930188405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686025.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 68930188405 in words is "sixty-eight billion, nine hundred thirty million, one hundred eighty-eight thousand, four hundred five".