1601661045 has 16 divisors (see below), whose sum is σ = 2566825920. Its totient is φ = 852829824.

The previous prime is 1601661041. The next prime is 1601661053. The reversal of 1601661045 is 5401661061.

It is not a de Polignac number, because 1601661045 - 2² = 1601661041 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601661041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77275 + ... + 95784.

It is an arithmetic number, because the mean of its divisors is an integer number (160426620).

Almost surely, 2^1601661045 is an apocalyptic number.

1601661045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1601661045 is a deficient number, since it is larger than the sum of its proper divisors (965164875).

1601661045 is a wasteful number, since it uses less digits than its factorization.

1601661045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173684.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1601661045 is about 40020.7576764858. The cubic root of 1601661045 is about 1170.0116990575.

The spelling of 1601661045 in words is "one billion, six hundred one million, six hundred sixty-one thousand, forty-five".