123995221618 has 8 divisors (see below), whose sum is σ = 190529243100. Its totient is φ = 60485473920.

The previous prime is 123995221481. The next prime is 123995221621. The reversal of 123995221618 is 816122599321.

It can be written as a sum of positive squares in 2 ways, for example, as 122883199209 + 1112022409 = 350547^2 + 33347^2 .

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, 756068343 + ... + 756068506.

Almost surely, 2^123995221618 is an apocalyptic number.

123995221618 is a deficient number, since it is larger than the sum of its proper divisors (66534021482).

123995221618 is a wasteful number, since it uses less digits than its factorization.

123995221618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512136892.

The product of its digits is 466560, while the sum is 49.

The spelling of 123995221618 in words is "one hundred twenty-three billion, nine hundred ninety-five million, two hundred twenty-one thousand, six hundred eighteen".