1601668449 has 12 divisors (see below), whose sum is σ = 2317278756. Its totient is φ = 1066044672.

The previous prime is 1601668423. The next prime is 1601668451. The reversal of 1601668449 is 9448661061.

It can be written as a sum of positive squares in 2 ways, for example, as 913550625 + 688117824 = 30225^2 + 26232^2 .

It is not a de Polignac number, because 1601668449 - 2⁵ = 1601668417 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1601668049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138664 + ... + 149769.

It is an arithmetic number, because the mean of its divisors is an integer number (193106563).

Almost surely, 2^1601668449 is an apocalyptic number.

It is an amenable number.

1601668449 is a deficient number, since it is larger than the sum of its proper divisors (715610307).

1601668449 is a wasteful number, since it uses less digits than its factorization.

1601668449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289056 (or 289053 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1601668449 is about 40020.8501783758. The cubic root of 1601668449 is about 1170.0135019261.

The spelling of 1601668449 in words is "one billion, six hundred one million, six hundred sixty-eight thousand, four hundred forty-nine".