11211664061 has 16 divisors (see below), whose sum is σ = 12447463728. Its totient is φ = 10032422400.

The previous prime is 11211663997. The next prime is 11211664109. The reversal of 11211664061 is 16046611211.

It is a happy number.

11211664061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 464402500 + 10747261561 = 21550^2 + 103669^2 .

It is not a de Polignac number, because 11211664061 - 2⁶ = 11211663997 is a prime.

It is a super-2 number, since 2×11211664061² (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 (11211664661) 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 15 ways as a sum of consecutive naturals, for example, 16691 + ... + 150671.

It is an arithmetic number, because the mean of its divisors is an integer number (777966483).

Almost surely, 2^11211664061 is an apocalyptic number.

It is an amenable number.

11211664061 is a deficient number, since it is larger than the sum of its proper divisors (1235799667).

11211664061 is a wasteful number, since it uses less digits than its factorization.

11211664061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134192.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 11211664061 in words is "eleven billion, two hundred eleven million, six hundred sixty-four thousand, sixty-one".