1797291478161 has 45 divisors (see below), whose sum is σ = 2700342143499. Its totient is φ = 1196239678776.

The previous prime is 1797291478153. The next prime is 1797291478207. The reversal of 1797291478161 is 1618741927971.

The square root of 1797291478161 is 1340631.

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

1797291478161 is a `hidden beast` number, since 1 + 7 + 9 + 72 + 91 + 478 + 1 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5859137025 + 1791432341136 = 76545^2 + 1338444^2 .

It is not a de Polignac number, because 1797291478161 - 2³ = 1797291478153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1797291479161) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2931959691 + ... + 2931960303.

Almost surely, 2^{1797291478161} is an apocalyptic number.

1797291478161 is the 1340631-st square number.

1797291478161 is the 670316-th centered octagonal number.

It is an amenable number.

1797291478161 is a deficient number, since it is larger than the sum of its proper divisors (903050665338).

1797291478161 is an frugal number, since it uses more digits than its factorization.

1797291478161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 616 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 63.

The spelling of 1797291478161 in words is "one trillion, seven hundred ninety-seven billion, two hundred ninety-one million, four hundred seventy-eight thousand, one hundred sixty-one".