16564040451465 has 32 divisors (see below), whose sum is σ = 28700563489920. Its totient is φ = 8109048062976.

The previous prime is 16564040451457. The next prime is 16564040451467. The reversal of 16564040451465 is 56415404046561.

It is not a de Polignac number, because 16564040451465 - 2³ = 16564040451457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16564040451467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237238272 + ... + 237308081.

It is an arithmetic number, because the mean of its divisors is an integer number (896892609060).

Almost surely, 2^{16564040451465} is an apocalyptic number.

16564040451465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16564040451465 is a deficient number, since it is larger than the sum of its proper divisors (12136523038455).

16564040451465 is a wasteful number, since it uses less digits than its factorization.

16564040451465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474546553.

The product of its (nonzero) digits is 6912000, while the sum is 51.

The spelling of 16564040451465 in words is "sixteen trillion, five hundred sixty-four billion, forty million, four hundred fifty-one thousand, four hundred sixty-five".