16403612520 has 32 divisors (see below), whose sum is σ = 49210837920. Its totient is φ = 4374296640.

The previous prime is 16403612503. The next prime is 16403612527. The reversal of 16403612520 is 2521630461.

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 (16403612527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68348266 + ... + 68348505.

It is an arithmetic number, because the mean of its divisors is an integer number (1537838685).

Almost surely, 2^16403612520 is an apocalyptic number.

16403612520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16403612520 is an abundant number, since it is smaller than the sum of its proper divisors (32807225400).

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

16403612520 is a wasteful number, since it uses less digits than its factorization.

16403612520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136696785 (or 136696781 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 16403612520 in words is "sixteen billion, four hundred three million, six hundred twelve thousand, five hundred twenty".