78141690691 has 2 divisors, whose sum is σ = 78141690692. Its totient is φ = 78141690690.

The previous prime is 78141690677. The next prime is 78141690701. The reversal of 78141690691 is 19609614187.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78141690691 is a prime.

It is a super-2 number, since 2×78141690691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78141690611) 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, 39070845345 + 39070845346.

It is an arithmetic number, because the mean of its divisors is an integer number (39070845346).

Almost surely, 2^78141690691 is an apocalyptic number.

78141690691 is a deficient number, since it is larger than the sum of its proper divisors (1).

78141690691 is an equidigital number, since it uses as much as digits as its factorization.

78141690691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 78141690691 in words is "seventy-eight billion, one hundred forty-one million, six hundred ninety thousand, six hundred ninety-one".