1550000120155 has 4 divisors (see below), whose sum is σ = 1860000144192. Its totient is φ = 1240000096120.

The previous prime is 1550000120147. The next prime is 1550000120173. The reversal of 1550000120155 is 5510210000551.

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

It is not a de Polignac number, because 1550000120155 - 2³ = 1550000120147 is a prime.

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, 155000012011 + ... + 155000012020.

It is an arithmetic number, because the mean of its divisors is an integer number (465000036048).

Almost surely, 2^{1550000120155} is an apocalyptic number.

1550000120155 is a deficient number, since it is larger than the sum of its proper divisors (310000024037).

1550000120155 is an equidigital number, since it uses as much as digits as its factorization.

1550000120155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310000024036.

The product of its (nonzero) digits is 1250, while the sum is 25.

The spelling of 1550000120155 in words is "one trillion, five hundred fifty billion, one hundred twenty thousand, one hundred fifty-five".