78901121113 has 2 divisors, whose sum is σ = 78901121114. Its totient is φ = 78901121112.

The previous prime is 78901121087. The next prime is 78901121129. The reversal of 78901121113 is 31112110987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70762916169 + 8138204944 = 266013^2 + 90212^2 .

It is an emirp because it is prime and its reverse (31112110987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78901121113 - 2⁵ = 78901121081 is a prime.

It is not a weakly prime, because it can be changed into another prime (78301121113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39450560556 + 39450560557.

It is an arithmetic number, because the mean of its divisors is an integer number (39450560557).

Almost surely, 2^78901121113 is an apocalyptic number.

It is an amenable number.

78901121113 is a deficient number, since it is larger than the sum of its proper divisors (1).

78901121113 is an equidigital number, since it uses as much as digits as its factorization.

78901121113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 34.

The spelling of 78901121113 in words is "seventy-eight billion, nine hundred one million, one hundred twenty-one thousand, one hundred thirteen".