1555565648 has 40 divisors (see below), whose sum is σ = 3709429248. Its totient is φ = 615388032.

The previous prime is 1555565629. The next prime is 1555565681. The reversal of 1555565648 is 8465655551.

It is a super-3 number, since 3×1555565648³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1555565596 and 1555565605.

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, 532736 + ... + 535647.

Almost surely, 2^1555565648 is an apocalyptic number.

It is an amenable number.

1555565648 is an abundant number, since it is smaller than the sum of its proper divisors (2153863600).

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

1555565648 is a wasteful number, since it uses less digits than its factorization.

1555565648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068411 (or 1068405 counting only the distinct ones).

The product of its digits is 3600000, while the sum is 50.

The square root of 1555565648 is about 39440.6598322087. The cubic root of 1555565648 is about 1158.6780541190.

The spelling of 1555565648 in words is "one billion, five hundred fifty-five million, five hundred sixty-five thousand, six hundred forty-eight".