1661010155 has 16 divisors (see below), whose sum is σ = 2306795520. Its totient is φ = 1124559072.

The previous prime is 1661010151. The next prime is 1661010173. The reversal of 1661010155 is 5510101661.

It is not a de Polignac number, because 1661010155 - 2² = 1661010151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661010151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297599 + ... + 303128.

It is an arithmetic number, because the mean of its divisors is an integer number (144174720).

Almost surely, 2^1661010155 is an apocalyptic number.

1661010155 is a deficient number, since it is larger than the sum of its proper divisors (645785365).

1661010155 is an equidigital number, since it uses as much as digits as its factorization.

1661010155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600818.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1661010155 is about 40755.4923292555. The cubic root of 1661010155 is about 1184.2882739735.

The spelling of 1661010155 in words is "one billion, six hundred sixty-one million, ten thousand, one hundred fifty-five".