78701994149 has 2 divisors, whose sum is σ = 78701994150. Its totient is φ = 78701994148.

The previous prime is 78701994127. The next prime is 78701994179. The reversal of 78701994149 is 94149910787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78391600225 + 310393924 = 279985^2 + 17618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78701994149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78701994179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39350997074 + 39350997075.

It is an arithmetic number, because the mean of its divisors is an integer number (39350997075).

Almost surely, 2^78701994149 is an apocalyptic number.

It is an amenable number.

78701994149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78701994149 is an equidigital number, since it uses as much as digits as its factorization.

78701994149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 59.

The spelling of 78701994149 in words is "seventy-eight billion, seven hundred one million, nine hundred ninety-four thousand, one hundred forty-nine".