78545402377349 has 2 divisors, whose sum is σ = 78545402377350. Its totient is φ = 78545402377348.

The previous prime is 78545402377301. The next prime is 78545402377493. The reversal of 78545402377349 is 94377320454587.

Together with next prime (78545402377493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51036478816324 + 27508923561025 = 7143982^2 + 5244895^2 .

It is a cyclic number.

It is not a de Polignac number, because 78545402377349 - 2⁸ = 78545402377093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78545402376349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39272701188674 + 39272701188675.

It is an arithmetic number, because the mean of its divisors is an integer number (39272701188675).

Almost surely, 2^{78545402377349} is an apocalyptic number.

It is an amenable number.

78545402377349 is a deficient number, since it is larger than the sum of its proper divisors (1).

78545402377349 is an equidigital number, since it uses as much as digits as its factorization.

78545402377349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 711244800, while the sum is 68.

The spelling of 78545402377349 in words is "seventy-eight trillion, five hundred forty-five billion, four hundred two million, three hundred seventy-seven thousand, three hundred forty-nine".