1666051616001 has 4 divisors (see below), whose sum is σ = 2221402154672. Its totient is φ = 1110701077332.

The previous prime is 1666051615937. The next prime is 1666051616023. The reversal of 1666051616001 is 1006161506661.

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 not a de Polignac number, because 1666051616001 - 2⁶ = 1666051615937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666051716001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277675269331 + ... + 277675269336.

It is an arithmetic number, because the mean of its divisors is an integer number (555350538668).

Almost surely, 2^{1666051616001} is an apocalyptic number.

It is an amenable number.

1666051616001 is a deficient number, since it is larger than the sum of its proper divisors (555350538671).

1666051616001 is an equidigital number, since it uses as much as digits as its factorization.

1666051616001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555350538670.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 1666051616001 in words is "one trillion, six hundred sixty-six billion, fifty-one million, six hundred sixteen thousand, one".