1603158613281 has 27 divisors (see below), whose sum is σ = 2322855871921. Its totient is φ = 1065467733864.

The previous prime is 1603158613279. The next prime is 1603158613283. The reversal of 1603158613281 is 1823168513061.

The square root of 1603158613281 is 1266159.

It is a perfect power (a square), and thus also a powerful number.

1603158613281 is a `hidden beast` number, since 1 + 6 + 0 + 3 + 1 + 5 + 8 + 613 + 28 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1603158613279) and next prime (1603158613283).

It is not a de Polignac number, because 1603158613281 - 2¹ = 1603158613279 is a prime.

It is a super-2 number, since 2×1603158613281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1603158613283) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2229705640 + ... + 2229706358.

Almost surely, 2^{1603158613281} is an apocalyptic number.

1603158613281 is the 1266159-th square number.

1603158613281 is the 633080-th centered octagonal number.

It is an amenable number.

1603158613281 is a deficient number, since it is larger than the sum of its proper divisors (719697258640).

1603158613281 is an frugal number, since it uses more digits than its factorization.

1603158613281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 1603158613281 in words is "one trillion, six hundred three billion, one hundred fifty-eight million, six hundred thirteen thousand, two hundred eighty-one".