68147755521 has 8 divisors (see below), whose sum is σ = 91324911744. Its totient is φ = 45201218160.

The previous prime is 68147755513. The next prime is 68147755523. The reversal of 68147755521 is 12555774186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68147755521 - 2³ = 68147755513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68147755523) 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, 57654025 + ... + 57655206.

It is an arithmetic number, because the mean of its divisors is an integer number (11415613968).

Almost surely, 2^68147755521 is an apocalyptic number.

It is an amenable number.

68147755521 is a deficient number, since it is larger than the sum of its proper divisors (23177156223).

68147755521 is a wasteful number, since it uses less digits than its factorization.

68147755521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115309431.

The product of its digits is 2352000, while the sum is 51.

The spelling of 68147755521 in words is "sixty-eight billion, one hundred forty-seven million, seven hundred fifty-five thousand, five hundred twenty-one".