1818445957680 has 80 divisors (see below), whose sum is σ = 6149653611264. Its totient is φ = 440835383040.

The previous prime is 1818445957631. The next prime is 1818445957697. The reversal of 1818445957680 is 867595448181.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344400004 + ... + 344405283.

Almost surely, 2^{1818445957680} is an apocalyptic number.

1818445957680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818445957680 is an abundant number, since it is smaller than the sum of its proper divisors (4331207653584).

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

1818445957680 is a wasteful number, since it uses less digits than its factorization.

1818445957680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688805314 (or 688805308 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 66.

The spelling of 1818445957680 in words is "one trillion, eight hundred eighteen billion, four hundred forty-five million, nine hundred fifty-seven thousand, six hundred eighty".