78106053661 has 2 divisors, whose sum is σ = 78106053662. Its totient is φ = 78106053660.

The previous prime is 78106053647. The next prime is 78106053737. The reversal of 78106053661 is 16635060187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73437748036 + 4668305625 = 270994^2 + 68325^2 .

It is a cyclic number.

It is not a de Polignac number, because 78106053661 - 2¹³ = 78106045469 is a prime.

It is a super-2 number, since 2×78106053661² (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 (78106050661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39053026830 + 39053026831.

It is an arithmetic number, because the mean of its divisors is an integer number (39053026831).

Almost surely, 2^78106053661 is an apocalyptic number.

It is an amenable number.

78106053661 is a deficient number, since it is larger than the sum of its proper divisors (1).

78106053661 is an equidigital number, since it uses as much as digits as its factorization.

78106053661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 78106053661 in words is "seventy-eight billion, one hundred six million, fifty-three thousand, six hundred sixty-one".