1666604464 has 30 divisors (see below), whose sum is σ = 3756239124. Its totient is φ = 714258720.

The previous prime is 1666604419. The next prime is 1666604491. The reversal of 1666604464 is 4644066661.

It is a super-3 number, since 3×1666604464³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1666604464.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1062102 + ... + 1063669.

Almost surely, 2^1666604464 is an apocalyptic number.

1666604464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1666604464 is an abundant number, since it is smaller than the sum of its proper divisors (2089634660).

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

1666604464 is a wasteful number, since it uses less digits than its factorization.

1666604464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125793 (or 2125780 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 43.

The square root of 1666604464 is about 40824.0672153082. The cubic root of 1666604464 is about 1185.6163514299.

The spelling of 1666604464 in words is "one billion, six hundred sixty-six million, six hundred four thousand, four hundred sixty-four".