1985654618 has 4 divisors (see below), whose sum is σ = 2978481930. Its totient is φ = 992827308.

The previous prime is 1985654611. The next prime is 1985654633. The reversal of 1985654618 is 8164565891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8164565891 = 37 ⋅220663943.

It can be written as a sum of positive squares in only one way, i.e., 1602160729 + 383493889 = 40027^2 + 19583^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1985654618.

It is not an unprimeable number, because it can be changed into a prime (1985654611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496413653 + ... + 496413656.

Almost surely, 2^1985654618 is an apocalyptic number.

1985654618 is a deficient number, since it is larger than the sum of its proper divisors (992827312).

1985654618 is an equidigital number, since it uses as much as digits as its factorization.

1985654618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992827311.

The product of its digits is 2073600, while the sum is 53.

The square root of 1985654618 is about 44560.6846670919. The cubic root of 1985654618 is about 1256.9014774008.

The spelling of 1985654618 in words is "one billion, nine hundred eighty-five million, six hundred fifty-four thousand, six hundred eighteen".