1555100005105 has 4 divisors (see below), whose sum is σ = 1866120006132. Its totient is φ = 1244080004080.

The previous prime is 1555100005099. The next prime is 1555100005111. The reversal of 1555100005105 is 5015000015551.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1555100005099) and next prime (1555100005111).

It can be written as a sum of positive squares in 2 ways, for example, as 1165173442624 + 389926562481 = 1079432^2 + 624441^2 .

It is not a de Polignac number, because 1555100005105 - 2⁵ = 1555100005073 is a prime.

It is a super-2 number, since 2×1555100005105² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155510000506 + ... + 155510000515.

It is an arithmetic number, because the mean of its divisors is an integer number (466530001533).

Almost surely, 2^{1555100005105} is an apocalyptic number.

It is an amenable number.

1555100005105 is a deficient number, since it is larger than the sum of its proper divisors (311020001027).

1555100005105 is an equidigital number, since it uses as much as digits as its factorization.

1555100005105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311020001026.

The product of its (nonzero) digits is 3125, while the sum is 28.

The spelling of 1555100005105 in words is "one trillion, five hundred fifty-five billion, one hundred million, five thousand, one hundred five".