84786721695811 has 2 divisors, whose sum is σ = 84786721695812. Its totient is φ = 84786721695810.

The previous prime is 84786721695791. The next prime is 84786721695821. The reversal of 84786721695811 is 11859612768748.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84786721695811 - 2¹¹ = 84786721693763 is a prime.

It is a super-2 number, since 2×84786721695811² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84786721695821) 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, 42393360847905 + 42393360847906.

It is an arithmetic number, because the mean of its divisors is an integer number (42393360847906).

Almost surely, 2^{84786721695811} is an apocalyptic number.

84786721695811 is a deficient number, since it is larger than the sum of its proper divisors (1).

84786721695811 is an equidigital number, since it uses as much as digits as its factorization.

84786721695811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 325140480, while the sum is 73.

The spelling of 84786721695811 in words is "eighty-four trillion, seven hundred eighty-six billion, seven hundred twenty-one million, six hundred ninety-five thousand, eight hundred eleven".