78765173853 has 16 divisors (see below), whose sum is σ = 105791616000. Its totient is φ = 52124537520.

The previous prime is 78765173849. The next prime is 78765173939. The reversal of 78765173853 is 35837156787.

It is not a de Polignac number, because 78765173853 - 2² = 78765173849 is a prime.

It is a super-2 number, since 2×78765173853² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78765173453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4494438 + ... + 4511928.

It is an arithmetic number, because the mean of its divisors is an integer number (6611976000).

Almost surely, 2^78765173853 is an apocalyptic number.

It is an amenable number.

78765173853 is a deficient number, since it is larger than the sum of its proper divisors (27026442147).

78765173853 is a wasteful number, since it uses less digits than its factorization.

78765173853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28432.

The product of its digits is 29635200, while the sum is 60.

The spelling of 78765173853 in words is "seventy-eight billion, seven hundred sixty-five million, one hundred seventy-three thousand, eight hundred fifty-three".