77328781829617 has 2 divisors, whose sum is σ = 77328781829618. Its totient is φ = 77328781829616.

The previous prime is 77328781829587. The next prime is 77328781829633. The reversal of 77328781829617 is 71692818782377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69181405111296 + 8147376718321 = 8317536^2 + 2854361^2 .

It is a cyclic number.

It is not a de Polignac number, because 77328781829617 - 2¹⁹ = 77328781305329 is a prime.

It is not a weakly prime, because it can be changed into another prime (77328721829617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38664390914808 + 38664390914809.

It is an arithmetic number, because the mean of its divisors is an integer number (38664390914809).

Almost surely, 2^{77328781829617} is an apocalyptic number.

It is an amenable number.

77328781829617 is a deficient number, since it is larger than the sum of its proper divisors (1).

77328781829617 is an equidigital number, since it uses as much as digits as its factorization.

77328781829617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 796594176, while the sum is 76.

The spelling of 77328781829617 in words is "seventy-seven trillion, three hundred twenty-eight billion, seven hundred eighty-one million, eight hundred twenty-nine thousand, six hundred seventeen".