1555663456 has 48 divisors (see below), whose sum is σ = 3229148160. Its totient is φ = 735696000.

The previous prime is 1555663433. The next prime is 1555663471. The reversal of 1555663456 is 6543665551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454905 + ... + 458311.

It is an arithmetic number, because the mean of its divisors is an integer number (67273920).

Almost surely, 2^1555663456 is an apocalyptic number.

1555663456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555663456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1614574080).

1555663456 is an abundant number, since it is smaller than the sum of its proper divisors (1673484704).

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

1555663456 is a wasteful number, since it uses less digits than its factorization.

1555663456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187 (or 4179 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 46.

The square root of 1555663456 is about 39441.8997514065. The cubic root of 1555663456 is about 1158.7023380204.

The spelling of 1555663456 in words is "one billion, five hundred fifty-five million, six hundred sixty-three thousand, four hundred fifty-six".