1659581960961 has 16 divisors (see below), whose sum is σ = 2221669866240. Its totient is φ = 1101943489920.

The previous prime is 1659581960929. The next prime is 1659581960999. The reversal of 1659581960961 is 1690691859561.

It is not a de Polignac number, because 1659581960961 - 2⁵ = 1659581960929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1659581960892 and 1659581960901.

It is not an unprimeable number, because it can be changed into a prime (1659581960261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2390221 + ... + 3005381.

It is an arithmetic number, because the mean of its divisors is an integer number (138854366640).

Almost surely, 2^{1659581960961} is an apocalyptic number.

It is an amenable number.

1659581960961 is a deficient number, since it is larger than the sum of its proper divisors (562087905279).

1659581960961 is a wasteful number, since it uses less digits than its factorization.

1659581960961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618776.

The product of its (nonzero) digits is 31492800, while the sum is 66.

The spelling of 1659581960961 in words is "one trillion, six hundred fifty-nine billion, five hundred eighty-one million, nine hundred sixty thousand, nine hundred sixty-one".