71778299017 has 2 divisors, whose sum is σ = 71778299018. Its totient is φ = 71778299016.

The previous prime is 71778299003. The next prime is 71778299041. The reversal of 71778299017 is 71099287717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70984412041 + 793886976 = 266429^2 + 28176^2 .

It is a cyclic number.

It is not a de Polignac number, because 71778299017 - 2¹¹ = 71778296969 is a prime.

It is not a weakly prime, because it can be changed into another prime (71778291017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35889149508 + 35889149509.

It is an arithmetic number, because the mean of its divisors is an integer number (35889149509).

Almost surely, 2^71778299017 is an apocalyptic number.

It is an amenable number.

71778299017 is a deficient number, since it is larger than the sum of its proper divisors (1).

71778299017 is an equidigital number, since it uses as much as digits as its factorization.

71778299017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3111696, while the sum is 58.

The spelling of 71778299017 in words is "seventy-one billion, seven hundred seventy-eight million, two hundred ninety-nine thousand, seventeen".