1111567900721 has 2 divisors, whose sum is σ = 1111567900722. Its totient is φ = 1111567900720.

The previous prime is 1111567900633. The next prime is 1111567900747. The reversal of 1111567900721 is 1270097651111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100115690496 + 11452210225 = 1048864^2 + 107015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111567900721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111567909721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555783950360 + 555783950361.

It is an arithmetic number, because the mean of its divisors is an integer number (555783950361).

Almost surely, 2^{1111567900721} is an apocalyptic number.

It is an amenable number.

1111567900721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111567900721 is an equidigital number, since it uses as much as digits as its factorization.

1111567900721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 41.

The spelling of 1111567900721 in words is "one trillion, one hundred eleven billion, five hundred sixty-seven million, nine hundred thousand, seven hundred twenty-one".