1601601556 has 6 divisors (see below), whose sum is σ = 2802802730. Its totient is φ = 800800776.

The previous prime is 1601601553. The next prime is 1601601557. The reversal of 1601601556 is 6551061061.

It can be written as a sum of positive squares in only one way, i.e., 1601600400 + 1156 = 40020^2 + 34^2 .

It is a super-2 number, since 2×1601601556² = 5130255088363242272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601601553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200191 + ... + 200200198.

Almost surely, 2^1601601556 is an apocalyptic number.

It is an amenable number.

1601601556 is a deficient number, since it is larger than the sum of its proper divisors (1201201174).

1601601556 is a wasteful number, since it uses less digits than its factorization.

1601601556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400400393 (or 400400391 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1601601556 is about 40020.0144427760. The cubic root of 1601601556 is about 1169.9972133277.

The spelling of 1601601556 in words is "one billion, six hundred one million, six hundred one thousand, five hundred fifty-six".