78619689241 has 2 divisors, whose sum is σ = 78619689242. Its totient is φ = 78619689240.

The previous prime is 78619689221. The next prime is 78619689259. The reversal of 78619689241 is 14298691687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76438425625 + 2181263616 = 276475^2 + 46704^2 .

It is a cyclic number.

It is not a de Polignac number, because 78619689241 - 2⁹ = 78619688729 is a prime.

It is a super-2 number, since 2×78619689241² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78619689241.

It is not a weakly prime, because it can be changed into another prime (78619689221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39309844620 + 39309844621.

It is an arithmetic number, because the mean of its divisors is an integer number (39309844621).

Almost surely, 2^78619689241 is an apocalyptic number.

It is an amenable number.

78619689241 is a deficient number, since it is larger than the sum of its proper divisors (1).

78619689241 is an equidigital number, since it uses as much as digits as its factorization.

78619689241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 61.

The spelling of 78619689241 in words is "seventy-eight billion, six hundred nineteen million, six hundred eighty-nine thousand, two hundred forty-one".