1601990455 has 16 divisors (see below), whose sum is σ = 2109330720. Its totient is φ = 1160684928.

The previous prime is 1601990449. The next prime is 1601990501. The reversal of 1601990455 is 5540991061.

It is not a de Polignac number, because 1601990455 - 2³ = 1601990447 is a prime.

It is a super-3 number, since 3×1601990455³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229065 + ... + 235954.

It is an arithmetic number, because the mean of its divisors is an integer number (131833170).

Almost surely, 2^1601990455 is an apocalyptic number.

1601990455 is a deficient number, since it is larger than the sum of its proper divisors (507340265).

1601990455 is a wasteful number, since it uses less digits than its factorization.

1601990455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465090.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 1601990455 is about 40024.8729542019. The cubic root of 1601990455 is about 1170.0919047781.

The spelling of 1601990455 in words is "one billion, six hundred one million, nine hundred ninety thousand, four hundred fifty-five".