68820821547 has 16 divisors (see below), whose sum is σ = 93954860160. Its totient is φ = 44795786112.

The previous prime is 68820821501. The next prime is 68820821561. The reversal of 68820821547 is 74512802886.

It is not a de Polignac number, because 68820821547 - 2¹⁵ = 68820788779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68820821547.

It is not an unprimeable number, because it can be changed into a prime (68820861547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492297 + ... + 1537722.

It is an arithmetic number, because the mean of its divisors is an integer number (5872178760).

Almost surely, 2^68820821547 is an apocalyptic number.

68820821547 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

68820821547 is a deficient number, since it is larger than the sum of its proper divisors (25134038613).

68820821547 is a wasteful number, since it uses less digits than its factorization.

68820821547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030202.

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 68820821547 in words is "sixty-eight billion, eight hundred twenty million, eight hundred twenty-one thousand, five hundred forty-seven".