78685262181 has 12 divisors (see below), whose sum is σ = 115025846208. Its totient is φ = 51824830824.

The previous prime is 78685262179. The next prime is 78685262189. The reversal of 78685262181 is 18126258687.

78685262181 is a `hidden beast` number, since 7 + 8 + 6 + 8 + 5 + 2 + 621 + 8 + 1 = 666.

It is not a de Polignac number, because 78685262181 - 2¹ = 78685262179 is a prime.

It is a super-2 number, since 2×78685262181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78685262189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52666765 + ... + 52668258.

It is an arithmetic number, because the mean of its divisors is an integer number (9585487184).

Almost surely, 2^78685262181 is an apocalyptic number.

It is an amenable number.

78685262181 is a deficient number, since it is larger than the sum of its proper divisors (36340584027).

78685262181 is a wasteful number, since it uses less digits than its factorization.

78685262181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105335112 (or 105335109 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The spelling of 78685262181 in words is "seventy-eight billion, six hundred eighty-five million, two hundred sixty-two thousand, one hundred eighty-one".