1553105666 has 24 divisors (see below), whose sum is σ = 2776115916. Its totient is φ = 649380480.

The previous prime is 1553105641. The next prime is 1553105677. The reversal of 1553105666 is 6665013551.

It can be written as a sum of positive squares in 2 ways, for example, as 1323431641 + 229674025 = 36379^2 + 15155^2 .

It is a super-2 number, since 2×1553105666² = 4824274419522607112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189251 + ... + 197286.

Almost surely, 2^1553105666 is an apocalyptic number.

1553105666 is a deficient number, since it is larger than the sum of its proper divisors (1223010250).

1553105666 is a wasteful number, since it uses less digits than its factorization.

1553105666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386594 (or 386587 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 1553105666 is about 39409.4616304258. The cubic root of 1553105666 is about 1158.0669514438.

The spelling of 1553105666 in words is "one billion, five hundred fifty-three million, one hundred five thousand, six hundred sixty-six".