1661155508 has 12 divisors (see below), whose sum is σ = 2977925412. Its totient is φ = 810319680.

The previous prime is 1661155499. The next prime is 1661155511. The reversal of 1661155508 is 8055511661.

It can be written as a sum of positive squares in 2 ways, for example, as 860718244 + 800437264 = 29338^2 + 28292^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5064335 + ... + 5064662.

It is an arithmetic number, because the mean of its divisors is an integer number (248160451).

Almost surely, 2^1661155508 is an apocalyptic number.

It is an amenable number.

1661155508 is a deficient number, since it is larger than the sum of its proper divisors (1316769904).

1661155508 is a wasteful number, since it uses less digits than its factorization.

1661155508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10129042 (or 10129040 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 1661155508 is about 40757.2755222917. The cubic root of 1661155508 is about 1184.3228181798.

The spelling of 1661155508 in words is "one billion, six hundred sixty-one million, one hundred fifty-five thousand, five hundred eight".