16000520405 has 4 divisors (see below), whose sum is σ = 19200624492. Its totient is φ = 12800416320.

The previous prime is 16000520359. The next prime is 16000520449. The reversal of 16000520405 is 50402500061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50402500061 = 18397 ⋅2739713.

It can be written as a sum of positive squares in 2 ways, for example, as 4767488209 + 11233032196 = 69047^2 + 105986^2 .

It is not a de Polignac number, because 16000520405 - 2¹² = 16000516309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600052036 + ... + 1600052045.

It is an arithmetic number, because the mean of its divisors is an integer number (4800156123).

Almost surely, 2^16000520405 is an apocalyptic number.

It is an amenable number.

16000520405 is a deficient number, since it is larger than the sum of its proper divisors (3200104087).

16000520405 is an equidigital number, since it uses as much as digits as its factorization.

16000520405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200104086.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 16000520405 in words is "sixteen billion, five hundred twenty thousand, four hundred five".