6978434371709 has 2 divisors, whose sum is σ = 6978434371710. Its totient is φ = 6978434371708.

The previous prime is 6978434371663. The next prime is 6978434371717. The reversal of 6978434371709 is 9071734348796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6798274022500 + 180160349209 = 2607350^2 + 424453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6978434371709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6978434371729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3489217185854 + 3489217185855.

It is an arithmetic number, because the mean of its divisors is an integer number (3489217185855).

Almost surely, 2^{6978434371709} is an apocalyptic number.

It is an amenable number.

6978434371709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978434371709 is an equidigital number, since it uses as much as digits as its factorization.

6978434371709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192036096, while the sum is 68.

The spelling of 6978434371709 in words is "six trillion, nine hundred seventy-eight billion, four hundred thirty-four million, three hundred seventy-one thousand, seven hundred nine".