16664121500 has 48 divisors (see below), whose sum is σ = 39194029056. Its totient is φ = 6152904000.

The previous prime is 16664121443. The next prime is 16664121533. The reversal of 16664121500 is 512146661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275356 + ... + 1288355.

It is an arithmetic number, because the mean of its divisors is an integer number (816542272).

Almost surely, 2^16664121500 is an apocalyptic number.

16664121500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16664121500 is an abundant number, since it is smaller than the sum of its proper divisors (22529907556).

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

16664121500 is a wasteful number, since it uses less digits than its factorization.

16664121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563743 (or 2563731 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 16664121500 in words is "sixteen billion, six hundred sixty-four million, one hundred twenty-one thousand, five hundred".