1666834620 has 48 divisors (see below), whose sum is σ = 5091424128. Its totient is φ = 404080960.

The previous prime is 1666834607. The next prime is 1666834621. The reversal of 1666834620 is 264386661.

1666834620 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666834621) 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, 1262094 + ... + 1263413.

It is an arithmetic number, because the mean of its divisors is an integer number (106071336).

Almost surely, 2^1666834620 is an apocalyptic number.

1666834620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666834620 is an abundant number, since it is smaller than the sum of its proper divisors (3424589508).

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

1666834620 is a wasteful number, since it uses less digits than its factorization.

1666834620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525530 (or 2525528 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 1666834620 is about 40826.8859944032. The cubic root of 1666834620 is about 1185.6709262981.

The spelling of 1666834620 in words is "one billion, six hundred sixty-six million, eight hundred thirty-four thousand, six hundred twenty".