78112102001977 has 2 divisors, whose sum is σ = 78112102001978. Its totient is φ = 78112102001976.

The previous prime is 78112102001951. The next prime is 78112102002017. The reversal of 78112102001977 is 77910020121187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40116971769616 + 37995130232361 = 6333796^2 + 6164019^2 .

It is a cyclic number.

It is not a de Polignac number, because 78112102001977 - 2⁷ = 78112102001849 is a prime.

It is a super-2 number, since 2×78112102001977² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78112102091977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39056051000988 + 39056051000989.

It is an arithmetic number, because the mean of its divisors is an integer number (39056051000989).

Almost surely, 2^{78112102001977} is an apocalyptic number.

It is an amenable number.

78112102001977 is a deficient number, since it is larger than the sum of its proper divisors (1).

78112102001977 is an equidigital number, since it uses as much as digits as its factorization.

78112102001977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 46.

The spelling of 78112102001977 in words is "seventy-eight trillion, one hundred twelve billion, one hundred two million, one thousand, nine hundred seventy-seven".