6616501500 has 192 divisors, whose sum is σ = 22083489792. Its totient is φ = 1507968000.

The previous prime is 6616501481. The next prime is 6616501501. The reversal of 6616501500 is 51056166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6616501501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4860820 + ... + 4862180.

It is an arithmetic number, because the mean of its divisors is an integer number (115018176).

Almost surely, 2^6616501500 is an apocalyptic number.

6616501500 is a gapful number since it is divisible by the number (60) 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 6616501500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11041744896).

6616501500 is an abundant number, since it is smaller than the sum of its proper divisors (15466988292).

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

6616501500 is a wasteful number, since it uses less digits than its factorization.

6616501500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853 (or 1841 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 6616501500 is about 81341.8803569231. The cubic root of 6616501500 is about 1877.3394442973.

Adding to 6616501500 its reverse (51056166), we get a palindrome (6667557666).

The spelling of 6616501500 in words is "six billion, six hundred sixteen million, five hundred one thousand, five hundred".