1555118883440 has 80 divisors (see below), whose sum is σ = 3637149874176. Its totient is φ = 618357024000.

The previous prime is 1555118883427. The next prime is 1555118883457. The reversal of 1555118883440 is 443888115551.

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

It is a congruent number.

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, 12264365 + ... + 12390515.

Almost surely, 2^{1555118883440} is an apocalyptic number.

1555118883440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555118883440 is an abundant number, since it is smaller than the sum of its proper divisors (2082030990736).

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

1555118883440 is a wasteful number, since it uses less digits than its factorization.

1555118883440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127078 (or 127072 counting only the distinct ones).

The product of its (nonzero) digits is 3072000, while the sum is 53.

The spelling of 1555118883440 in words is "one trillion, five hundred fifty-five billion, one hundred eighteen million, eight hundred eighty-three thousand, four hundred forty".