78936078882461 has 2 divisors, whose sum is σ = 78936078882462. Its totient is φ = 78936078882460.

The previous prime is 78936078882377. The next prime is 78936078882503. The reversal of 78936078882461 is 16428887063987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78669910595236 + 266168287225 = 8869606^2 + 515915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78936078882461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78936077882461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468039441230 + 39468039441231.

It is an arithmetic number, because the mean of its divisors is an integer number (39468039441231).

Almost surely, 2^{78936078882461} is an apocalyptic number.

It is an amenable number.

78936078882461 is a deficient number, since it is larger than the sum of its proper divisors (1).

78936078882461 is an equidigital number, since it uses as much as digits as its factorization.

78936078882461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1560674304, while the sum is 77.

The spelling of 78936078882461 in words is "seventy-eight trillion, nine hundred thirty-six billion, seventy-eight million, eight hundred eighty-two thousand, four hundred sixty-one".