11531406166 has 32 divisors (see below), whose sum is σ = 20814888960. Its totient is φ = 4680498816.

The previous prime is 11531406143. The next prime is 11531406181. The reversal of 11531406166 is 66160413511.

It is a super-3 number, since 3×11531406166³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1630510 + ... + 1637566.

It is an arithmetic number, because the mean of its divisors is an integer number (650465280).

Almost surely, 2^11531406166 is an apocalyptic number.

11531406166 is a deficient number, since it is larger than the sum of its proper divisors (9283482794).

11531406166 is a wasteful number, since it uses less digits than its factorization.

11531406166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13228.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 11531406166 its reverse (66160413511), we get a palindrome (77691819677).

The spelling of 11531406166 in words is "eleven billion, five hundred thirty-one million, four hundred six thousand, one hundred sixty-six".