1533631666 has 16 divisors (see below), whose sum is σ = 2666113920. Its totient is φ = 648012960.

The previous prime is 1533631657. The next prime is 1533631681. The reversal of 1533631666 is 6661363351.

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 7 ways as a sum of consecutive naturals, for example, 770451 + ... + 772438.

It is an arithmetic number, because the mean of its divisors is an integer number (166632120).

Almost surely, 2^1533631666 is an apocalyptic number.

1533631666 is a deficient number, since it is larger than the sum of its proper divisors (1132482254).

1533631666 is a wasteful number, since it uses less digits than its factorization.

1533631666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542969.

The product of its digits is 174960, while the sum is 40.

The square root of 1533631666 is about 39161.6095940910. The cubic root of 1533631666 is about 1153.2063427473.

The spelling of 1533631666 in words is "one billion, five hundred thirty-three million, six hundred thirty-one thousand, six hundred sixty-six".