78212145049 has 2 divisors, whose sum is σ = 78212145050. Its totient is φ = 78212145048.

The previous prime is 78212145029. The next prime is 78212145131. The reversal of 78212145049 is 94054121287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59612640649 + 18599504400 = 244157^2 + 136380^2 .

It is a cyclic number.

It is not a de Polignac number, because 78212145049 - 2⁵ = 78212145017 is a prime.

It is a super-2 number, since 2×78212145049² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78212144996 and 78212145014.

It is not a weakly prime, because it can be changed into another prime (78212145029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106072524 + 39106072525.

It is an arithmetic number, because the mean of its divisors is an integer number (39106072525).

Almost surely, 2^78212145049 is an apocalyptic number.

It is an amenable number.

78212145049 is a deficient number, since it is larger than the sum of its proper divisors (1).

78212145049 is an equidigital number, since it uses as much as digits as its factorization.

78212145049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 78212145049 in words is "seventy-eight billion, two hundred twelve million, one hundred forty-five thousand, forty-nine".