16140605405 has 4 divisors (see below), whose sum is σ = 19368726492. Its totient is φ = 12912484320.

The previous prime is 16140605399. The next prime is 16140605461. The reversal of 16140605405 is 50450604161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4764036484 + 11376568921 = 69022^2 + 106661^2 .

It is not a de Polignac number, because 16140605405 - 2²⁸ = 15872169949 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, 1614060536 + ... + 1614060545.

It is an arithmetic number, because the mean of its divisors is an integer number (4842181623).

Almost surely, 2^16140605405 is an apocalyptic number.

It is an amenable number.

16140605405 is a deficient number, since it is larger than the sum of its proper divisors (3228121087).

16140605405 is an equidigital number, since it uses as much as digits as its factorization.

16140605405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228121086.

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 16140605405 in words is "sixteen billion, one hundred forty million, six hundred five thousand, four hundred five".