16505501610 has 192 divisors, whose sum is σ = 44253651456. Its totient is φ = 3935692800.

The previous prime is 16505501591. The next prime is 16505501611. The reversal of 16505501610 is 1610550561.

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

It is not an unprimeable number, because it can be changed into a prime (16505501611) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 56332624 + ... + 56332916.

It is an arithmetic number, because the mean of its divisors is an integer number (230487768).

Almost surely, 2^16505501610 is an apocalyptic number.

16505501610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16505501610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22126825728).

16505501610 is an abundant number, since it is smaller than the sum of its proper divisors (27748149846).

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

16505501610 is a wasteful number, since it uses less digits than its factorization.

16505501610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 16505501610 in words is "sixteen billion, five hundred five million, five hundred one thousand, six hundred ten".