1661065410002 has 4 divisors (see below), whose sum is σ = 2491598115006. Its totient is φ = 830532705000.

The previous prime is 1661065409999. The next prime is 1661065410007. The reversal of 1661065410002 is 2000145601661.

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

It can be written as a sum of positive squares in only one way, i.e., 1525178070361 + 135887339641 = 1234981^2 + 368629^2 .

It is a super-2 number, since 2×1661065410002² (a number of 25 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 415266352499 + ... + 415266352502.

Almost surely, 2^{1661065410002} is an apocalyptic number.

1661065410002 is a deficient number, since it is larger than the sum of its proper divisors (830532705004).

1661065410002 is an equidigital number, since it uses as much as digits as its factorization.

1661065410002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830532705003.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 1661065410002 in words is "one trillion, six hundred sixty-one billion, sixty-five million, four hundred ten thousand, two".