78106053517 has 2 divisors, whose sum is σ = 78106053518. Its totient is φ = 78106053516.

The previous prime is 78106053457. The next prime is 78106053643. The reversal of 78106053517 is 71535060187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51268733476 + 26837320041 = 226426^2 + 163821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78106053517 is a prime.

It is a super-2 number, since 2×78106053517² (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 (78106033517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39053026758 + 39053026759.

It is an arithmetic number, because the mean of its divisors is an integer number (39053026759).

Almost surely, 2^78106053517 is an apocalyptic number.

It is an amenable number.

78106053517 is a deficient number, since it is larger than the sum of its proper divisors (1).

78106053517 is an equidigital number, since it uses as much as digits as its factorization.

78106053517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 78106053517 in words is "seventy-eight billion, one hundred six million, fifty-three thousand, five hundred seventeen".