16520352240 has 160 divisors (see below), whose sum is σ = 58833662976. Its totient is φ = 3756441600.

The previous prime is 16520352181. The next prime is 16520352241. The reversal of 16520352240 is 4225302561.

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

It is a junction number, because it is equal to n+sod(n) for n = 16520352198 and 16520352207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520352241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298765 + ... + 349715.

Almost surely, 2^16520352240 is an apocalyptic number.

16520352240 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 16520352240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29416831488).

16520352240 is an abundant number, since it is smaller than the sum of its proper divisors (42313310736).

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

16520352240 is a wasteful number, since it uses less digits than its factorization.

16520352240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51167 (or 51161 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 16520352240 in words is "sixteen billion, five hundred twenty million, three hundred fifty-two thousand, two hundred forty".