1683661618 has 4 divisors (see below), whose sum is σ = 2525492430. Its totient is φ = 841830808.

The previous prime is 1683661601. The next prime is 1683661669. The reversal of 1683661618 is 8161663861.

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., 1597041369 + 86620249 = 39963^2 + 9307^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420915403 + ... + 420915406.

Almost surely, 2^1683661618 is an apocalyptic number.

1683661618 is a deficient number, since it is larger than the sum of its proper divisors (841830812).

1683661618 is an equidigital number, since it uses as much as digits as its factorization.

1683661618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841830811.

The product of its digits is 248832, while the sum is 46.

The square root of 1683661618 is about 41032.4459178343. The cubic root of 1683661618 is about 1189.6474293885.

The spelling of 1683661618 in words is "one billion, six hundred eighty-three million, six hundred sixty-one thousand, six hundred eighteen".