1662643802 has 4 divisors (see below), whose sum is σ = 2493965706. Its totient is φ = 831321900.

The previous prime is 1662643769. The next prime is 1662643823. The reversal of 1662643802 is 2083462661.

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

It can be written as a sum of positive squares in only one way, i.e., 944886121 + 717757681 = 30739^2 + 26791^2 .

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 as a sum of consecutive naturals, namely, 415660949 + ... + 415660952.

Almost surely, 2^1662643802 is an apocalyptic number.

1662643802 is a deficient number, since it is larger than the sum of its proper divisors (831321904).

1662643802 is an equidigital number, since it uses as much as digits as its factorization.

1662643802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831321903.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 1662643802 is about 40775.5294508851. The cubic root of 1662643802 is about 1184.6764062691.

The spelling of 1662643802 in words is "one billion, six hundred sixty-two million, six hundred forty-three thousand, eight hundred two".