1666506452 has 24 divisors (see below), whose sum is σ = 3213768096. Its totient is φ = 751268448.

The previous prime is 1666506449. The next prime is 1666506467. The reversal of 1666506452 is 2546056661.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 370418 + ... + 374889.

It is an arithmetic number, because the mean of its divisors is an integer number (133907004).

Almost surely, 2^1666506452 is an apocalyptic number.

It is an amenable number.

1666506452 is a deficient number, since it is larger than the sum of its proper divisors (1547261644).

1666506452 is a wasteful number, since it uses less digits than its factorization.

1666506452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745367 (or 745365 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 1666506452 is about 40822.8667783143. The cubic root of 1666506452 is about 1185.5931091809.

The spelling of 1666506452 in words is "one billion, six hundred sixty-six million, five hundred six thousand, four hundred fifty-two".