1066166661500 has 48 divisors (see below), whose sum is σ = 2330332804800. Its totient is φ = 426132449600.

The previous prime is 1066166661383. The next prime is 1066166661503. The reversal of 1066166661500 is 51666616601.

It is a super-2 number, since 2×1066166661500² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066166661503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196400 + ... + 1473399.

It is an arithmetic number, because the mean of its divisors is an integer number (48548600100).

Almost surely, 2^{1066166661500} is an apocalyptic number.

1066166661500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066166661500 is an abundant number, since it is smaller than the sum of its proper divisors (1264166143300).

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

1066166661500 is a wasteful number, since it uses less digits than its factorization.

1066166661500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671095 (or 1671083 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 1066166661500 in words is "one trillion, sixty-six billion, one hundred sixty-six million, six hundred sixty-one thousand, five hundred".