1918373738208 has 24 divisors (see below), whose sum is σ = 5035731063048. Its totient is φ = 639457912704.

The previous prime is 1918373738189. The next prime is 1918373738209. The reversal of 1918373738208 is 8028373738191.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1918373738208² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918373738209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9991529791 + ... + 9991529982.

It is an arithmetic number, because the mean of its divisors is an integer number (209822127627).

Almost surely, 2^{1918373738208} is an apocalyptic number.

It is an amenable number.

1918373738208 is an abundant number, since it is smaller than the sum of its proper divisors (3117357324840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918373738208 is a wasteful number, since it uses less digits than its factorization.

1918373738208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19983059786 (or 19983059778 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 1918373738208 in words is "one trillion, nine hundred eighteen billion, three hundred seventy-three million, seven hundred thirty-eight thousand, two hundred eight".