1006660061661 has 4 divisors (see below), whose sum is σ = 1342213415552. Its totient is φ = 671106707772.

The previous prime is 1006660061653. The next prime is 1006660061669. The reversal of 1006660061661 is 1661600666001.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (1006660061653) and next prime (1006660061669).

It is not a de Polignac number, because 1006660061661 - 2³ = 1006660061653 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 (1006660061669) 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, 167776676941 + ... + 167776676946.

It is an arithmetic number, because the mean of its divisors is an integer number (335553353888).

Almost surely, 2^{1006660061661} is an apocalyptic number.

It is an amenable number.

1006660061661 is a deficient number, since it is larger than the sum of its proper divisors (335553353891).

1006660061661 is an equidigital number, since it uses as much as digits as its factorization.

1006660061661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335553353890.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 1006660061661 in words is "one trillion, six billion, six hundred sixty million, sixty-one thousand, six hundred sixty-one".