3778642437949 has 2 divisors, whose sum is σ = 3778642437950. Its totient is φ = 3778642437948.

The previous prime is 3778642437943. The next prime is 3778642437971. The reversal of 3778642437949 is 9497342468773.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3523571985924 + 255070452025 = 1877118^2 + 505045^2 .

It is a cyclic number.

It is not a de Polignac number, because 3778642437949 - 2¹⁷ = 3778642306877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3778642437943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1889321218974 + 1889321218975.

It is an arithmetic number, because the mean of its divisors is an integer number (1889321218975).

Almost surely, 2^{3778642437949} is an apocalyptic number.

It is an amenable number.

3778642437949 is a deficient number, since it is larger than the sum of its proper divisors (1).

3778642437949 is an equidigital number, since it uses as much as digits as its factorization.

3778642437949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536288768, while the sum is 73.

The spelling of 3778642437949 in words is "three trillion, seven hundred seventy-eight billion, six hundred forty-two million, four hundred thirty-seven thousand, nine hundred forty-nine".