9990561677 has 2 divisors, whose sum is σ = 9990561678. Its totient is φ = 9990561676.

The previous prime is 9990561653. The next prime is 9990561701. The reversal of 9990561677 is 7761650999.

It is a balanced prime because it is at equal distance from previous prime (9990561653) and next prime (9990561701).

It can be written as a sum of positive squares in only one way, i.e., 6420977161 + 3569584516 = 80131^2 + 59746^2 .

It is a cyclic number.

It is not a de Polignac number, because 9990561677 - 2¹⁰ = 9990560653 is a prime.

It is a super-2 number, since 2×9990561677² (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 (9990567677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995280838 + 4995280839.

It is an arithmetic number, because the mean of its divisors is an integer number (4995280839).

Almost surely, 2^9990561677 is an apocalyptic number.

It is an amenable number.

9990561677 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990561677 is an equidigital number, since it uses as much as digits as its factorization.

9990561677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6429780, while the sum is 59.

The square root of 9990561677 is about 99952.7972444994. The cubic root of 9990561677 is about 2153.7566683246.

The spelling of 9990561677 in words is "nine billion, nine hundred ninety million, five hundred sixty-one thousand, six hundred seventy-seven".