1550161555 has 4 divisors (see below), whose sum is σ = 1860193872. Its totient is φ = 1240129240.

The previous prime is 1550161523. The next prime is 1550161577. The reversal of 1550161555 is 5551610551.

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

It is not a de Polignac number, because 1550161555 - 2⁵ = 1550161523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1550161555.

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, 155016151 + ... + 155016160.

It is an arithmetic number, because the mean of its divisors is an integer number (465048468).

Almost surely, 2^1550161555 is an apocalyptic number.

1550161555 is a deficient number, since it is larger than the sum of its proper divisors (310032317).

1550161555 is an equidigital number, since it uses as much as digits as its factorization.

1550161555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310032316.

The product of its (nonzero) digits is 18750, while the sum is 34.

The square root of 1550161555 is about 39372.0910671506. The cubic root of 1550161555 is about 1157.3347337623.

The spelling of 1550161555 in words is "one billion, five hundred fifty million, one hundred sixty-one thousand, five hundred fifty-five".