1555651155 has 16 divisors (see below), whose sum is σ = 2519032320. Its totient is φ = 819683808.

The previous prime is 1555651133. The next prime is 1555651157. The reversal of 1555651155 is 5511565551.

It is not a de Polignac number, because 1555651155 - 2²⁰ = 1554602579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1555651157) 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 15 ways as a sum of consecutive naturals, for example, 623515 + ... + 626004.

It is an arithmetic number, because the mean of its divisors is an integer number (157439520).

Almost surely, 2^1555651155 is an apocalyptic number.

1555651155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1555651155 is a deficient number, since it is larger than the sum of its proper divisors (963381165).

1555651155 is a wasteful number, since it uses less digits than its factorization.

1555651155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249610.

The product of its digits is 93750, while the sum is 39.

The square root of 1555651155 is about 39441.7438128691. The cubic root of 1555651155 is about 1158.6992839675.

The spelling of 1555651155 in words is "one billion, five hundred fifty-five million, six hundred fifty-one thousand, one hundred fifty-five".