2161599232500 has 720 divisors, whose sum is σ = 7287749973504. Its totient is φ = 539136000000.

The previous prime is 2161599232489. The next prime is 2161599232553. The reversal of 2161599232500 is 52329951612.

2161599232500 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 59 + 92 + 3 + 2 + 500 = 666.

It is a super-2 number, since 2×2161599232500² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 3746272212 + ... + 3746272788.

Almost surely, 2^{2161599232500} is an apocalyptic number.

2161599232500 is a gapful number since it is divisible by the number (20) 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 2161599232500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3643874986752).

2161599232500 is an abundant number, since it is smaller than the sum of its proper divisors (5126150741004).

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

2161599232500 is a wasteful number, since it uses less digits than its factorization.

2161599232500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 2161599232500 in words is "two trillion, one hundred sixty-one billion, five hundred ninety-nine million, two hundred thirty-two thousand, five hundred".