68515123554 has 12 divisors (see below), whose sum is σ = 148449434406. Its totient is φ = 22838374512.

The previous prime is 68515123553. The next prime is 68515123583. The reversal of 68515123554 is 45532151586.

68515123554 is a `hidden beast` number, since 6 + 8 + 51 + 512 + 35 + 54 = 666.

It can be written as a sum of positive squares in only one way, i.e., 53673305625 + 14841817929 = 231675^2 + 121827^2 .

It is not an unprimeable number, because it can be changed into a prime (68515123553) 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, 1903197859 + ... + 1903197894.

Almost surely, 2^68515123554 is an apocalyptic number.

68515123554 is an abundant number, since it is smaller than the sum of its proper divisors (79934310852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68515123554 is a wasteful number, since it uses less digits than its factorization.

68515123554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806395761 (or 3806395758 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The spelling of 68515123554 in words is "sixty-eight billion, five hundred fifteen million, one hundred twenty-three thousand, five hundred fifty-four".