78715748149 has 2 divisors, whose sum is σ = 78715748150. Its totient is φ = 78715748148.

The previous prime is 78715748141. The next prime is 78715748179. The reversal of 78715748149 is 94184751787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49343958225 + 29371789924 = 222135^2 + 171382^2 .

It is a cyclic number.

It is not a de Polignac number, because 78715748149 - 2³ = 78715748141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78715748141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39357874074 + 39357874075.

It is an arithmetic number, because the mean of its divisors is an integer number (39357874075).

Almost surely, 2^78715748149 is an apocalyptic number.

It is an amenable number.

78715748149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78715748149 is an equidigital number, since it uses as much as digits as its factorization.

78715748149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15805440, while the sum is 61.

The spelling of 78715748149 in words is "seventy-eight billion, seven hundred fifteen million, seven hundred forty-eight thousand, one hundred forty-nine".