78510973091 has 2 divisors, whose sum is σ = 78510973092. Its totient is φ = 78510973090.

The previous prime is 78510973003. The next prime is 78510973111. The reversal of 78510973091 is 19037901587.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78510973091 is a prime.

It is a super-3 number, since 3×78510973091³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (78510973591) 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, 39255486545 + 39255486546.

It is an arithmetic number, because the mean of its divisors is an integer number (39255486546).

Almost surely, 2^78510973091 is an apocalyptic number.

78510973091 is a deficient number, since it is larger than the sum of its proper divisors (1).

78510973091 is an equidigital number, since it uses as much as digits as its factorization.

78510973091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 50.

The spelling of 78510973091 in words is "seventy-eight billion, five hundred ten million, nine hundred seventy-three thousand, ninety-one".