78176836949 has 2 divisors, whose sum is σ = 78176836950. Its totient is φ = 78176836948.

The previous prime is 78176836921. The next prime is 78176836987. The reversal of 78176836949 is 94963867187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72991828900 + 5185008049 = 270170^2 + 72007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78176836949 is a prime.

It is a super-3 number, since 3×78176836949³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78176836849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39088418474 + 39088418475.

It is an arithmetic number, because the mean of its divisors is an integer number (39088418475).

Almost surely, 2^78176836949 is an apocalyptic number.

It is an amenable number.

78176836949 is a deficient number, since it is larger than the sum of its proper divisors (1).

78176836949 is an equidigital number, since it uses as much as digits as its factorization.

78176836949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109734912, while the sum is 68.

The spelling of 78176836949 in words is "seventy-eight billion, one hundred seventy-six million, eight hundred thirty-six thousand, nine hundred forty-nine".