7447955939849 has 2 divisors, whose sum is σ = 7447955939850. Its totient is φ = 7447955939848.

The previous prime is 7447955939843. The next prime is 7447955939873. The reversal of 7447955939849 is 9489395597447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4825240469449 + 2622715470400 = 2196643^2 + 1619480^2 .

It is a cyclic number.

It is not a de Polignac number, because 7447955939849 - 2⁴ = 7447955939833 is a prime.

It is a super-2 number, since 2×7447955939849² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7447955939843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3723977969924 + 3723977969925.

It is an arithmetic number, because the mean of its divisors is an integer number (3723977969925).

Almost surely, 2^{7447955939849} is an apocalyptic number.

It is an amenable number.

7447955939849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7447955939849 is an equidigital number, since it uses as much as digits as its factorization.

7447955939849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12345177600, while the sum is 83.

The spelling of 7447955939849 in words is "seven trillion, four hundred forty-seven billion, nine hundred fifty-five million, nine hundred thirty-nine thousand, eight hundred forty-nine".