1664471730000 has 100 divisors (see below), whose sum is σ = 5373136770848. Its totient is φ = 443859120000.

The previous prime is 1664471729989. The next prime is 1664471730007. The reversal of 1664471730000 is 371744661.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×1664471730000² (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 (1664471730007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27711196 + ... + 27771195.

Almost surely, 2^{1664471730000} is an apocalyptic number.

1664471730000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664471730000 is an abundant number, since it is smaller than the sum of its proper divisors (3708665040848).

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

1664471730000 is an equidigital number, since it uses as much as digits as its factorization.

1664471730000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55482422 (or 55482401 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 1664471730000 in words is "one trillion, six hundred sixty-four billion, four hundred seventy-one million, seven hundred thirty thousand".