13778678629 has 2 divisors, whose sum is σ = 13778678630. Its totient is φ = 13778678628.

The previous prime is 13778678569. The next prime is 13778678659. The reversal of 13778678629 is 92687687731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10459766529 + 3318912100 = 102273^2 + 57610^2 .

It is a cyclic number.

It is not a de Polignac number, because 13778678629 - 2¹⁵ = 13778645861 is a prime.

It is a super-2 number, since 2×13778678629² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13778678659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6889339314 + 6889339315.

It is an arithmetic number, because the mean of its divisors is an integer number (6889339315).

Almost surely, 2^13778678629 is an apocalyptic number.

It is an amenable number.

13778678629 is a deficient number, since it is larger than the sum of its proper divisors (1).

13778678629 is an equidigital number, since it uses as much as digits as its factorization.

13778678629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 64.

The spelling of 13778678629 in words is "thirteen billion, seven hundred seventy-eight million, six hundred seventy-eight thousand, six hundred twenty-nine".