16662172500 has 240 divisors, whose sum is σ = 54302617600. Its totient is φ = 4416768000.

The previous prime is 16662172427. The next prime is 16662172511. The reversal of 16662172500 is 527126661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13026861 + ... + 13028139.

Almost surely, 2^16662172500 is an apocalyptic number.

16662172500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16662172500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27151308800).

16662172500 is an abundant number, since it is smaller than the sum of its proper divisors (37640445100).

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

16662172500 is a wasteful number, since it uses less digits than its factorization.

16662172500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

It can be divided in two parts, 166621 and 72500, that added together give a square (239121 = 489²).

The spelling of 16662172500 in words is "sixteen billion, six hundred sixty-two million, one hundred seventy-two thousand, five hundred".