1601665055 has 4 divisors (see below), whose sum is σ = 1921998072. Its totient is φ = 1281332040.

The previous prime is 1601665049. The next prime is 1601665057. The reversal of 1601665055 is 5505661061.

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

It is a de Polignac number, because none of the positive numbers 2^k-1601665055 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601665057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160166501 + ... + 160166510.

It is an arithmetic number, because the mean of its divisors is an integer number (480499518).

Almost surely, 2^1601665055 is an apocalyptic number.

1601665055 is a deficient number, since it is larger than the sum of its proper divisors (320333017).

1601665055 is an equidigital number, since it uses as much as digits as its factorization.

1601665055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320333016.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1601665055 is about 40020.8077754560. The cubic root of 1601665055 is about 1170.0126754903.

The spelling of 1601665055 in words is "one billion, six hundred one million, six hundred sixty-five thousand, fifty-five".