77023440409 has 2 divisors, whose sum is σ = 77023440410. Its totient is φ = 77023440408.

The previous prime is 77023440397. The next prime is 77023440437. The reversal of 77023440409 is 90404432077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42006552025 + 35016888384 = 204955^2 + 187128^2 .

It is a cyclic number.

It is not a de Polignac number, because 77023440409 - 2²⁷ = 76889222681 is a prime.

It is a super-2 number, since 2×77023440409² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77023440449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38511720204 + 38511720205.

It is an arithmetic number, because the mean of its divisors is an integer number (38511720205).

Almost surely, 2^77023440409 is an apocalyptic number.

It is an amenable number.

77023440409 is a deficient number, since it is larger than the sum of its proper divisors (1).

77023440409 is an equidigital number, since it uses as much as digits as its factorization.

77023440409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 77023440409 in words is "seventy-seven billion, twenty-three million, four hundred forty thousand, four hundred nine".