1555555656 has 16 divisors (see below), whose sum is σ = 3888889200. Its totient is φ = 518518544.

The previous prime is 1555555579. The next prime is 1555555657. The reversal of 1555555656 is 6565555551.

It is not an unprimeable number, because it can be changed into a prime (1555555657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32407386 + ... + 32407433.

It is an arithmetic number, because the mean of its divisors is an integer number (243055575).

Almost surely, 2^1555555656 is an apocalyptic number.

It is an amenable number.

1555555656 is an abundant number, since it is smaller than the sum of its proper divisors (2333333544).

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

1555555656 is a wasteful number, since it uses less digits than its factorization.

1555555656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64814828 (or 64814824 counting only the distinct ones).

The product of its digits is 2812500, while the sum is 48.

The square root of 1555555656 is about 39440.5331606965. The cubic root of 1555555656 is about 1158.6755732346.

The spelling of 1555555656 in words is "one billion, five hundred fifty-five million, five hundred fifty-five thousand, six hundred fifty-six".