1161666005 has 16 divisors (see below), whose sum is σ = 1419377904. Its totient is φ = 912468480.

The previous prime is 1161666001. The next prime is 1161666017. The reversal of 1161666005 is 5006661611.

It can be written as a sum of positive squares in 8 ways, for example, as 851589124 + 310076881 = 29182^2 + 17609^2 .

It is not a de Polignac number, because 1161666005 - 2² = 1161666001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161666001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185099 + ... + 191271.

It is an arithmetic number, because the mean of its divisors is an integer number (88711119).

Almost surely, 2^1161666005 is an apocalyptic number.

It is an amenable number.

1161666005 is a deficient number, since it is larger than the sum of its proper divisors (257711899).

1161666005 is an equidigital number, since it uses as much as digits as its factorization.

1161666005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1161666005 is about 34083.2217520586. The cubic root of 1161666005 is about 1051.2203513294.

The spelling of 1161666005 in words is "one billion, one hundred sixty-one million, six hundred sixty-six thousand, five".