78000099181 has 2 divisors, whose sum is σ = 78000099182. Its totient is φ = 78000099180.

The previous prime is 78000099097. The next prime is 78000099257. The reversal of 78000099181 is 18199000087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75812666281 + 2187432900 = 275341^2 + 46770^2 .

It is a cyclic number.

It is not a de Polignac number, because 78000099181 - 2²¹ = 77998002029 is a prime.

It is a super-2 number, since 2×78000099181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78000079181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39000049590 + 39000049591.

It is an arithmetic number, because the mean of its divisors is an integer number (39000049591).

Almost surely, 2^78000099181 is an apocalyptic number.

It is an amenable number.

78000099181 is a deficient number, since it is larger than the sum of its proper divisors (1).

78000099181 is an equidigital number, since it uses as much as digits as its factorization.

78000099181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 78000099181 in words is "seventy-eight billion, ninety-nine thousand, one hundred eighty-one".