1666361552 has 40 divisors (see below), whose sum is σ = 3304241640. Its totient is φ = 813795840.

The previous prime is 1666361531. The next prime is 1666361561. The reversal of 1666361552 is 2551636661.

It can be written as a sum of positive squares in 4 ways, for example, as 231770176 + 1434591376 = 15224^2 + 37876^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189902 + ... + 198482.

It is an arithmetic number, because the mean of its divisors is an integer number (82606041).

Almost surely, 2^1666361552 is an apocalyptic number.

It is an amenable number.

1666361552 is a deficient number, since it is larger than the sum of its proper divisors (1637880088).

1666361552 is a wasteful number, since it uses less digits than its factorization.

1666361552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871 (or 8865 counting only the distinct ones).

The product of its digits is 194400, while the sum is 41.

The square root of 1666361552 is about 40821.0919991124. The cubic root of 1666361552 is about 1185.5587463935.

The spelling of 1666361552 in words is "one billion, six hundred sixty-six million, three hundred sixty-one thousand, five hundred fifty-two".