1666016928 has 36 divisors (see below), whose sum is σ = 4737736458. Its totient is φ = 555338880.

The previous prime is 1666016927. The next prime is 1666016939. The reversal of 1666016928 is 8296106661.

It can be written as a sum of positive squares in only one way, i.e., 1578631824 + 87385104 = 39732^2 + 9348^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1666016928² = 5551224808765114368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1666016923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2892103 + ... + 2892678.

Almost surely, 2^1666016928 is an apocalyptic number.

1666016928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1666016928 is an abundant number, since it is smaller than the sum of its proper divisors (3071719530).

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

1666016928 is a wasteful number, since it uses less digits than its factorization.

1666016928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784797 (or 5784786 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1666016928 is about 40816.8706296796. The cubic root of 1666016928 is about 1185.4770113971.

The spelling of 1666016928 in words is "one billion, six hundred sixty-six million, sixteen thousand, nine hundred twenty-eight".