76543409389 has 2 divisors, whose sum is σ = 76543409390. Its totient is φ = 76543409388.

The previous prime is 76543409359. The next prime is 76543409417. The reversal of 76543409389 is 98390434567.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70414868164 + 6128541225 = 265358^2 + 78285^2 .

It is a cyclic number.

It is not a de Polignac number, because 76543409389 - 2¹⁵ = 76543376621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76543409309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38271704694 + 38271704695.

It is an arithmetic number, because the mean of its divisors is an integer number (38271704695).

Almost surely, 2^76543409389 is an apocalyptic number.

It is an amenable number.

76543409389 is a deficient number, since it is larger than the sum of its proper divisors (1).

76543409389 is an equidigital number, since it uses as much as digits as its factorization.

76543409389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 76543409389 in words is "seventy-six billion, five hundred forty-three million, four hundred nine thousand, three hundred eighty-nine".