78345328727741 has 2 divisors, whose sum is σ = 78345328727742. Its totient is φ = 78345328727740.

The previous prime is 78345328727719. The next prime is 78345328727773. The reversal of 78345328727741 is 14772782354387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43888968765625 + 34456359962116 = 6624875^2 + 5869954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78345328727741 is a prime.

It is a super-2 number, since 2×78345328727741² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78345328727041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39172664363870 + 39172664363871.

It is an arithmetic number, because the mean of its divisors is an integer number (39172664363871).

Almost surely, 2^{78345328727741} is an apocalyptic number.

It is an amenable number.

78345328727741 is a deficient number, since it is larger than the sum of its proper divisors (1).

78345328727741 is an equidigital number, since it uses as much as digits as its factorization.

78345328727741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442552320, while the sum is 68.

The spelling of 78345328727741 in words is "seventy-eight trillion, three hundred forty-five billion, three hundred twenty-eight million, seven hundred twenty-seven thousand, seven hundred forty-one".