76438389949 has 2 divisors, whose sum is σ = 76438389950. Its totient is φ = 76438389948.

The previous prime is 76438389871. The next prime is 76438389959. The reversal of 76438389949 is 94998383467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64640520025 + 11797869924 = 254245^2 + 108618^2 .

It is a cyclic number.

It is not a de Polignac number, because 76438389949 - 2¹¹ = 76438387901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76438389959) 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, 38219194974 + 38219194975.

It is an arithmetic number, because the mean of its divisors is an integer number (38219194975).

Almost surely, 2^76438389949 is an apocalyptic number.

It is an amenable number.

76438389949 is a deficient number, since it is larger than the sum of its proper divisors (1).

76438389949 is an equidigital number, since it uses as much as digits as its factorization.

76438389949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282175488, while the sum is 70.

The spelling of 76438389949 in words is "seventy-six billion, four hundred thirty-eight million, three hundred eighty-nine thousand, nine hundred forty-nine".