1202166578 has 6 divisors (see below), whose sum is σ = 1803323421. Its totient is φ = 601058772.

The previous prime is 1202166557. The next prime is 1202166619. The reversal of 1202166578 is 8756612021.

It can be written as a sum of positive squares in 2 ways, for example, as 1095808609 + 106357969 = 33103^2 + 10313^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24517.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 36776 + ... + 61292.

Almost surely, 2^1202166578 is an apocalyptic number.

1202166578 is a deficient number, since it is larger than the sum of its proper divisors (601156843).

1202166578 is an frugal number, since it uses more digits than its factorization.

1202166578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49036 (or 24519 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1202166578 is about 34672.2739087012. The cubic root of 1202166578 is about 1063.2977215324.

Adding to 1202166578 its reverse (8756612021), we get a palindrome (9958778599).

The spelling of 1202166578 in words is "one billion, two hundred two million, one hundred sixty-six thousand, five hundred seventy-eight".