16405506425 has 24 divisors (see below), whose sum is σ = 25362489792. Its totient is φ = 10226808000.

The previous prime is 16405506419. The next prime is 16405506427. The reversal of 16405506425 is 52460550461.

It is not a de Polignac number, because 16405506425 - 2⁶ = 16405506361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16405506427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4259246 + ... + 4263095.

It is an arithmetic number, because the mean of its divisors is an integer number (1056770408).

Almost surely, 2^16405506425 is an apocalyptic number.

It is an amenable number.

16405506425 is a deficient number, since it is larger than the sum of its proper divisors (8956983367).

16405506425 is a wasteful number, since it uses less digits than its factorization.

16405506425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8522369 (or 8522364 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 16405506425 in words is "sixteen billion, four hundred five million, five hundred six thousand, four hundred twenty-five".