16265551500 has 576 divisors, whose sum is σ = 58726467072. Its totient is φ = 3754944000.

The previous prime is 16265551469. The next prime is 16265551507. The reversal of 16265551500 is 515556261.

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

It is not an unprimeable number, because it can be changed into a prime (16265551507) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 152014447 + ... + 152014553.

It is an arithmetic number, because the mean of its divisors is an integer number (101955672).

Almost surely, 2^16265551500 is an apocalyptic number.

16265551500 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 16265551500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29363233536).

16265551500 is an abundant number, since it is smaller than the sum of its proper divisors (42460915572).

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

16265551500 is a wasteful number, since it uses less digits than its factorization.

16265551500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

It can be divided in two parts, 16265 and 551500, that added together give a palindrome (567765).

The spelling of 16265551500 in words is "sixteen billion, two hundred sixty-five million, five hundred fifty-one thousand, five hundred".