77440485869 has 2 divisors, whose sum is σ = 77440485870. Its totient is φ = 77440485868.

The previous prime is 77440485853. The next prime is 77440485929. The reversal of 77440485869 is 96858404477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54582976900 + 22857508969 = 233630^2 + 151187^2 .

It is a cyclic number.

It is not a de Polignac number, because 77440485869 - 2⁴ = 77440485853 is a prime.

It is a super-2 number, since 2×77440485869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77440488869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38720242934 + 38720242935.

It is an arithmetic number, because the mean of its divisors is an integer number (38720242935).

Almost surely, 2^77440485869 is an apocalyptic number.

It is an amenable number.

77440485869 is a deficient number, since it is larger than the sum of its proper divisors (1).

77440485869 is an equidigital number, since it uses as much as digits as its factorization.

77440485869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54190080, while the sum is 62.

The spelling of 77440485869 in words is "seventy-seven billion, four hundred forty million, four hundred eighty-five thousand, eight hundred sixty-nine".