78961105087 has 2 divisors, whose sum is σ = 78961105088. Its totient is φ = 78961105086.

The previous prime is 78961105073. The next prime is 78961105159. The reversal of 78961105087 is 78050116987.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78961105087 is a prime.

It is a super-3 number, since 3×78961105087³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78961105187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480552543 + 39480552544.

It is an arithmetic number, because the mean of its divisors is an integer number (39480552544).

Almost surely, 2^78961105087 is an apocalyptic number.

78961105087 is a deficient number, since it is larger than the sum of its proper divisors (1).

78961105087 is an equidigital number, since it uses as much as digits as its factorization.

78961105087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 52.

The spelling of 78961105087 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred five thousand, eighty-seven".