17970646561 has 6 divisors (see below), whose sum is σ = 20904629730. Its totient is φ = 15403411296.

The previous prime is 17970646523. The next prime is 17970646567. The reversal of 17970646561 is 16564607971.

It can be written as a sum of positive squares in only one way, i.e., 9040396561 + 8930250000 = 95081^2 + 94500^2 .

It is not a de Polignac number, because 17970646561 - 2¹⁹ = 17970122273 is a prime.

It is a super-2 number, since 2×17970646561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17970646499 and 17970646508.

It is not an unprimeable number, because it can be changed into a prime (17970646567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183373896 + ... + 183373993.

It is an arithmetic number, because the mean of its divisors is an integer number (3484104955).

Almost surely, 2^17970646561 is an apocalyptic number.

It is an amenable number.

17970646561 is a deficient number, since it is larger than the sum of its proper divisors (2933983169).

17970646561 is an equidigital number, since it uses as much as digits as its factorization.

17970646561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366747903 (or 366747896 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 17970646561 in words is "seventeen billion, nine hundred seventy million, six hundred forty-six thousand, five hundred sixty-one".