78821053853 has 16 divisors (see below), whose sum is σ = 81335487744. Its totient is φ = 76345464000.

The previous prime is 78821053793. The next prime is 78821053859. The reversal of 78821053853 is 35835012887.

It is a cyclic number.

It is not a de Polignac number, because 78821053853 - 2¹⁶ = 78820988317 is a prime.

It is a super-2 number, since 2×78821053853² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78821053859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1830851 + ... + 1873407.

It is an arithmetic number, because the mean of its divisors is an integer number (5083467984).

Almost surely, 2^78821053853 is an apocalyptic number.

It is an amenable number.

78821053853 is a deficient number, since it is larger than the sum of its proper divisors (2514433891).

78821053853 is a wasteful number, since it uses less digits than its factorization.

78821053853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43012.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 78821053853 in words is "seventy-eight billion, eight hundred twenty-one million, fifty-three thousand, eight hundred fifty-three".