1661065410001 has 4 divisors (see below), whose sum is σ = 1661114271600. Its totient is φ = 1661016548404.

The previous prime is 1661065409999. The next prime is 1661065410007. The reversal of 1661065410001 is 1000145601661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1661065410001 - 2¹ = 1661065409999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661065410007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24379771 + ... + 24447808.

It is an arithmetic number, because the mean of its divisors is an integer number (415278567900).

Almost surely, 2^{1661065410001} is an apocalyptic number.

It is an amenable number.

1661065410001 is a deficient number, since it is larger than the sum of its proper divisors (48861599).

1661065410001 is an equidigital number, since it uses as much as digits as its factorization.

1661065410001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48861598.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 1661065410001 in words is "one trillion, six hundred sixty-one billion, sixty-five million, four hundred ten thousand, one".