1662644477 has 6 divisors (see below), whose sum is σ = 1800378522. Its totient is φ = 1534748592.

The previous prime is 1662644453. The next prime is 1662644491. The reversal of 1662644477 is 7744462661.

It can be written as a sum of positive squares in 3 ways, for example, as 139381636 + 1523262841 = 11806^2 + 39029^2 .

It is not a de Polignac number, because 1662644477 - 2¹⁰ = 1662643453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662644377) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4918898 + ... + 4919235.

It is an arithmetic number, because the mean of its divisors is an integer number (300063087).

Almost surely, 2^1662644477 is an apocalyptic number.

It is an amenable number.

1662644477 is a deficient number, since it is larger than the sum of its proper divisors (137734045).

1662644477 is an equidigital number, since it uses as much as digits as its factorization.

1662644477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838159 (or 9838146 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 47.

The square root of 1662644477 is about 40775.5377279074. The cubic root of 1662644477 is about 1184.6765665873.

The spelling of 1662644477 in words is "one billion, six hundred sixty-two million, six hundred forty-four thousand, four hundred seventy-seven".