1288166645 has 4 divisors (see below), whose sum is σ = 1545799980. Its totient is φ = 1030533312.

The previous prime is 1288166629. The next prime is 1288166651. The reversal of 1288166645 is 5466618821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 206611876 + 1081554769 = 14374^2 + 32887^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288166645 - 2⁴ = 1288166629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1288166645.

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 3 ways as a sum of consecutive naturals, for example, 128816660 + ... + 128816669.

It is an arithmetic number, because the mean of its divisors is an integer number (386449995).

Almost surely, 2^1288166645 is an apocalyptic number.

It is an amenable number.

1288166645 is a deficient number, since it is larger than the sum of its proper divisors (257633335).

1288166645 is an equidigital number, since it uses as much as digits as its factorization.

1288166645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257633334.

The product of its digits is 552960, while the sum is 47.

The square root of 1288166645 is about 35891.0385054543. The cubic root of 1288166645 is about 1088.0712869259.

The spelling of 1288166645 in words is "one billion, two hundred eighty-eight million, one hundred sixty-six thousand, six hundred forty-five".