1555100145 has 24 divisors (see below), whose sum is σ = 2739700392. Its totient is φ = 815788800.

The previous prime is 1555100119. The next prime is 1555100153. The reversal of 1555100145 is 5410015551.

1555100145 is a `hidden beast` number, since 1 + 5 + 5 + 510 + 0 + 145 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11553201 + 1543546944 = 3399^2 + 39288^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1555100145 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 280516 + ... + 286005.

It is an arithmetic number, because the mean of its divisors is an integer number (114154183).

Almost surely, 2^1555100145 is an apocalyptic number.

1555100145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1555100145 is a deficient number, since it is larger than the sum of its proper divisors (1184600247).

1555100145 is a wasteful number, since it uses less digits than its factorization.

1555100145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566593 (or 566590 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1555100145 is about 39434.7580821792. The cubic root of 1555100145 is about 1158.5624644573.

Adding to 1555100145 its reverse (5410015551), we get a palindrome (6965115696).

The spelling of 1555100145 in words is "one billion, five hundred fifty-five million, one hundred thousand, one hundred forty-five".