1555565056 has 20 divisors (see below), whose sum is σ = 3108092922. Its totient is φ = 777782272.

The previous prime is 1555565023. The next prime is 1555565083. The reversal of 1555565056 is 6505655551.

It can be written as a sum of positive squares in only one way, i.e., 1123590400 + 431974656 = 33520^2 + 20784^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1518595 + ... + 1519618.

Almost surely, 2^1555565056 is an apocalyptic number.

1555565056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1555565056 is a deficient number, since it is larger than the sum of its proper divisors (1552527866).

1555565056 is an frugal number, since it uses more digits than its factorization.

1555565056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3038231 (or 3038215 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 43.

The square root of 1555565056 is about 39440.6523272625. The cubic root of 1555565056 is about 1158.6779071334.

The spelling of 1555565056 in words is "one billion, five hundred fifty-five million, five hundred sixty-five thousand, fifty-six".