9920263017661 has 2 divisors, whose sum is σ = 9920263017662. Its totient is φ = 9920263017660.

The previous prime is 9920263017659. The next prime is 9920263017683. The reversal of 9920263017661 is 1667103620299.

It is a happy number.

9920263017661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9878511860100 + 41751157561 = 3143010^2 + 204331^2 .

It is a cyclic number.

It is not a de Polignac number, because 9920263017661 - 2¹ = 9920263017659 is a prime.

Together with 9920263017659, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 9920263017599 and 9920263017608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9920263017631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960131508830 + 4960131508831.

It is an arithmetic number, because the mean of its divisors is an integer number (4960131508831).

Almost surely, 2^{9920263017661} is an apocalyptic number.

It is an amenable number.

9920263017661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920263017661 is an equidigital number, since it uses as much as digits as its factorization.

9920263017661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 9920263017661 in words is "nine trillion, nine hundred twenty billion, two hundred sixty-three million, seventeen thousand, six hundred sixty-one".