20763076661 has 4 divisors (see below), whose sum is σ = 20852188812. Its totient is φ = 20673964512.

The previous prime is 20763076657. The next prime is 20763076673. The reversal of 20763076661 is 16667036702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3660976036 + 17102100625 = 60506^2 + 130775^2 .

It is a cyclic number.

It is not a de Polignac number, because 20763076661 - 2² = 20763076657 is a prime.

It is a super-2 number, since 2×20763076661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20763076601) 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 in 3 ways as a sum of consecutive naturals, for example, 44555726 + ... + 44556191.

It is an arithmetic number, because the mean of its divisors is an integer number (5213047203).

Almost surely, 2^20763076661 is an apocalyptic number.

It is an amenable number.

20763076661 is a deficient number, since it is larger than the sum of its proper divisors (89112151).

20763076661 is an equidigital number, since it uses as much as digits as its factorization.

20763076661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89112150.

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 20763076661 in words is "twenty billion, seven hundred sixty-three million, seventy-six thousand, six hundred sixty-one".