78419537149 has 2 divisors, whose sum is σ = 78419537150. Its totient is φ = 78419537148.

The previous prime is 78419537023. The next prime is 78419537173. The reversal of 78419537149 is 94173591487.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56033991225 + 22385545924 = 236715^2 + 149618^2 .

It is an emirp because it is prime and its reverse (94173591487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78419537149 - 2¹¹ = 78419535101 is a prime.

It is a super-2 number, since 2×78419537149² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78419537093 and 78419537102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78419537849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39209768574 + 39209768575.

It is an arithmetic number, because the mean of its divisors is an integer number (39209768575).

Almost surely, 2^78419537149 is an apocalyptic number.

It is an amenable number.

78419537149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78419537149 is an equidigital number, since it uses as much as digits as its factorization.

78419537149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 58.

The spelling of 78419537149 in words is "seventy-eight billion, four hundred nineteen million, five hundred thirty-seven thousand, one hundred forty-nine".