10000111009961 has 2 divisors, whose sum is σ = 10000111009962. Its totient is φ = 10000111009960.

The previous prime is 10000111009949. The next prime is 10000111010027. The reversal of 10000111009961 is 16990011100001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9460121184361 + 539989825600 = 3075731^2 + 734840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10000111009961 is a prime.

It is a super-2 number, since 2×10000111009961² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10000111009901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000055504980 + 5000055504981.

It is an arithmetic number, because the mean of its divisors is an integer number (5000055504981).

Almost surely, 2^{10000111009961} is an apocalyptic number.

It is an amenable number.

10000111009961 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000111009961 is an equidigital number, since it uses as much as digits as its factorization.

10000111009961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 29.

Adding to 10000111009961 its reverse (16990011100001), we get a palindrome (26990122109962).

The spelling of 10000111009961 in words is "ten trillion, one hundred eleven million, nine thousand, nine hundred sixty-one".