78902565811 has 2 divisors, whose sum is σ = 78902565812. Its totient is φ = 78902565810.

The previous prime is 78902565793. The next prime is 78902565839. The reversal of 78902565811 is 11856520987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78902565811 - 2⁵ = 78902565779 is a prime.

It is a super-2 number, since 2×78902565811² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78902565871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39451282905 + 39451282906.

It is an arithmetic number, because the mean of its divisors is an integer number (39451282906).

Almost surely, 2^78902565811 is an apocalyptic number.

78902565811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78902565811 is an equidigital number, since it uses as much as digits as its factorization.

78902565811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 78902565811 in words is "seventy-eight billion, nine hundred two million, five hundred sixty-five thousand, eight hundred eleven".