1666938836592 has 120 divisors (see below), whose sum is σ = 4705897549808. Its totient is φ = 550808294400.

The previous prime is 1666938836587. The next prime is 1666938836621. The reversal of 1666938836592 is 2956388396661.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 1666938836592.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8055867 + ... + 8260197.

Almost surely, 2^{1666938836592} is an apocalyptic number.

1666938836592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666938836592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2352948774904).

1666938836592 is an abundant number, since it is smaller than the sum of its proper divisors (3038958713216).

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

1666938836592 is a wasteful number, since it uses less digits than its factorization.

1666938836592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204839 (or 204830 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 72.

The spelling of 1666938836592 in words is "one trillion, six hundred sixty-six billion, nine hundred thirty-eight million, eight hundred thirty-six thousand, five hundred ninety-two".