20835091663 has 2 divisors, whose sum is σ = 20835091664. Its totient is φ = 20835091662.

The previous prime is 20835091637. The next prime is 20835091721. The reversal of 20835091663 is 36619053802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20835091663 - 2¹³ = 20835083471 is a prime.

It is a super-2 number, since 2×20835091663² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20835091603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10417545831 + 10417545832.

It is an arithmetic number, because the mean of its divisors is an integer number (10417545832).

Almost surely, 2^20835091663 is an apocalyptic number.

20835091663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20835091663 is an equidigital number, since it uses as much as digits as its factorization.

20835091663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 20835091663 in words is "twenty billion, eight hundred thirty-five million, ninety-one thousand, six hundred sixty-three".