1671663525617 has 4 divisors (see below), whose sum is σ = 1671666225636. Its totient is φ = 1671660825600.

The previous prime is 1671663525611. The next prime is 1671663525659. The reversal of 1671663525617 is 7165253661761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1630016511841 + 41647013776 = 1276721^2 + 204076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671663525617 - 2⁸ = 1671663525361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671663525611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92393 + ... + 1830809.

It is an arithmetic number, because the mean of its divisors is an integer number (417916556409).

Almost surely, 2^{1671663525617} is an apocalyptic number.

It is an amenable number.

1671663525617 is a deficient number, since it is larger than the sum of its proper divisors (2700019).

1671663525617 is an equidigital number, since it uses as much as digits as its factorization.

1671663525617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700018.

The product of its digits is 9525600, while the sum is 56.

The spelling of 1671663525617 in words is "one trillion, six hundred seventy-one billion, six hundred sixty-three million, five hundred twenty-five thousand, six hundred seventeen".