1665000061559 has 4 divisors (see below), whose sum is σ = 1705609819200. Its totient is φ = 1624390303920.

The previous prime is 1665000061471. The next prime is 1665000061561. The reversal of 1665000061559 is 9551600005661.

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

It is a cyclic number.

It is not a de Polignac number, because 1665000061559 - 2²⁴ = 1664983284343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665000061259) 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, 20304878759 + ... + 20304878840.

It is an arithmetic number, because the mean of its divisors is an integer number (426402454800).

Almost surely, 2^{1665000061559} is an apocalyptic number.

1665000061559 is a deficient number, since it is larger than the sum of its proper divisors (40609757641).

1665000061559 is an equidigital number, since it uses as much as digits as its factorization.

1665000061559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40609757640.

The product of its (nonzero) digits is 243000, while the sum is 44.

The spelling of 1665000061559 in words is "one trillion, six hundred sixty-five billion, sixty-one thousand, five hundred fifty-nine".