20761006663 has 2 divisors, whose sum is σ = 20761006664. Its totient is φ = 20761006662.

The previous prime is 20761006589. The next prime is 20761006711. The reversal of 20761006663 is 36660016702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20761006663 - 2¹⁷ = 20760875591 is a prime.

It is a super-2 number, since 2×20761006663² (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 (20761006363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10380503331 + 10380503332.

It is an arithmetic number, because the mean of its divisors is an integer number (10380503332).

Almost surely, 2^20761006663 is an apocalyptic number.

20761006663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20761006663 is an equidigital number, since it uses as much as digits as its factorization.

20761006663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 20761006663 in words is "twenty billion, seven hundred sixty-one million, six thousand, six hundred sixty-three".