1666106620602 has 8 divisors (see below), whose sum is σ = 3332213241216. Its totient is φ = 555368873532.

The previous prime is 1666106620597. The next prime is 1666106620621. The reversal of 1666106620602 is 2060266016661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1666106620602 is an admirable number.

It is a super-2 number, since 2×1666106620602² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138842218378 + ... + 138842218389.

It is an arithmetic number, because the mean of its divisors is an integer number (416526655152).

Almost surely, 2^{1666106620602} is an apocalyptic number.

1666106620602 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666106620602 is a wasteful number, since it uses less digits than its factorization.

1666106620602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277684436772.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 1666106620602 in words is "one trillion, six hundred sixty-six billion, one hundred six million, six hundred twenty thousand, six hundred two".