77209534469 has 2 divisors, whose sum is σ = 77209534470. Its totient is φ = 77209534468.

The previous prime is 77209534459. The next prime is 77209534511. The reversal of 77209534469 is 96443590277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54598397569 + 22611136900 = 233663^2 + 150370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77209534469 is a prime.

It is a super-2 number, since 2×77209534469² (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 (77209534459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38604767234 + 38604767235.

It is an arithmetic number, because the mean of its divisors is an integer number (38604767235).

Almost surely, 2^77209534469 is an apocalyptic number.

It is an amenable number.

77209534469 is a deficient number, since it is larger than the sum of its proper divisors (1).

77209534469 is an equidigital number, since it uses as much as digits as its factorization.

77209534469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 77209534469 in words is "seventy-seven billion, two hundred nine million, five hundred thirty-four thousand, four hundred sixty-nine".