1662662669 has 4 divisors (see below), whose sum is σ = 1668579900. Its totient is φ = 1656745440.

The previous prime is 1662662653. The next prime is 1662662671. The reversal of 1662662669 is 9662662661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1395993769 + 266668900 = 37363^2 + 16330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662662669 - 2⁴ = 1662662653 is a prime.

It is a super-2 number, since 2×1662662669² = 5528894301772407122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662662699) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2958194 + ... + 2958755.

It is an arithmetic number, because the mean of its divisors is an integer number (417144975).

Almost surely, 2^1662662669 is an apocalyptic number.

It is an amenable number.

1662662669 is a deficient number, since it is larger than the sum of its proper divisors (5917231).

1662662669 is an equidigital number, since it uses as much as digits as its factorization.

1662662669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5917230.

The product of its digits is 1679616, while the sum is 50.

The square root of 1662662669 is about 40775.7608022217. The cubic root of 1662662669 is about 1184.6808873261.

The spelling of 1662662669 in words is "one billion, six hundred sixty-two million, six hundred sixty-two thousand, six hundred sixty-nine".