1662443887 has 16 divisors (see below), whose sum is σ = 1871912448. Its totient is φ = 1464899040.

The previous prime is 1662443873. The next prime is 1662443971. The reversal of 1662443887 is 7883442661.

It is a cyclic number.

It is not a de Polignac number, because 1662443887 - 2¹¹ = 1662441839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1662443887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662443837) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 151062 + ... + 161692.

It is an arithmetic number, because the mean of its divisors is an integer number (116994528).

Almost surely, 2^1662443887 is an apocalyptic number.

1662443887 is a deficient number, since it is larger than the sum of its proper divisors (209468561).

1662443887 is a wasteful number, since it uses less digits than its factorization.

1662443887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11190.

The product of its digits is 1548288, while the sum is 49.

The square root of 1662443887 is about 40773.0779681888. The cubic root of 1662443887 is about 1184.6289228421.

The spelling of 1662443887 in words is "one billion, six hundred sixty-two million, four hundred forty-three thousand, eight hundred eighty-seven".