1821663802 has 32 divisors (see below), whose sum is σ = 3271456512. Its totient is φ = 743829504.

The previous prime is 1821663799. The next prime is 1821663829. The reversal of 1821663802 is 2083661281.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71748 + ... + 93760.

It is an arithmetic number, because the mean of its divisors is an integer number (102233016).

Almost surely, 2^1821663802 is an apocalyptic number.

1821663802 is a deficient number, since it is larger than the sum of its proper divisors (1449792710).

1821663802 is a wasteful number, since it uses less digits than its factorization.

1821663802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22302.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1821663802 is about 42680.9536210240. The cubic root of 1821663802 is about 1221.3010848494.

The spelling of 1821663802 in words is "one billion, eight hundred twenty-one million, six hundred sixty-three thousand, eight hundred two".