78681756149 has 16 divisors (see below), whose sum is σ = 84401584128. Its totient is φ = 73089257472.

The previous prime is 78681756059. The next prime is 78681756157. The reversal of 78681756149 is 94165718687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78681756149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78681756091 and 78681756100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78681756449) 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, 322274 + ... + 511100.

It is an arithmetic number, because the mean of its divisors is an integer number (5275099008).

Almost surely, 2^78681756149 is an apocalyptic number.

It is an amenable number.

78681756149 is a deficient number, since it is larger than the sum of its proper divisors (5719827979).

78681756149 is a wasteful number, since it uses less digits than its factorization.

78681756149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189164.

The product of its digits is 20321280, while the sum is 62.

The spelling of 78681756149 in words is "seventy-eight billion, six hundred eighty-one million, seven hundred fifty-six thousand, one hundred forty-nine".