1966625618 has 8 divisors (see below), whose sum is σ = 2954101260. Its totient is φ = 981925200.

The previous prime is 1966625593. The next prime is 1966625657. The reversal of 1966625618 is 8165266691.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1942781929 + 23843689 = 44077^2 + 4883^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692033 + ... + 694868.

Almost surely, 2^1966625618 is an apocalyptic number.

1966625618 is a deficient number, since it is larger than the sum of its proper divisors (987475642).

1966625618 is a wasteful number, since it uses less digits than its factorization.

1966625618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387612.

The product of its digits is 933120, while the sum is 50.

The square root of 1966625618 is about 44346.6528387431. The cubic root of 1966625618 is about 1252.8735210795.

The spelling of 1966625618 in words is "one billion, nine hundred sixty-six million, six hundred twenty-five thousand, six hundred eighteen".