16545720172765 has 16 divisors (see below), whose sum is σ = 22728290168448. Its totient is φ = 11327128295616.

The previous prime is 16545720172759. The next prime is 16545720172799. The reversal of 16545720172765 is 56727102754561.

It is a happy number.

It is not a de Polignac number, because 16545720172765 - 2³³ = 16537130238173 is a prime.

It is a super-2 number, since 2×16545720172765² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 385569787 + ... + 385612696.

It is an arithmetic number, because the mean of its divisors is an integer number (1420518135528).

Almost surely, 2^{16545720172765} is an apocalyptic number.

It is an amenable number.

16545720172765 is a deficient number, since it is larger than the sum of its proper divisors (6182569995683).

16545720172765 is an equidigital number, since it uses as much as digits as its factorization.

16545720172765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771183108.

The product of its (nonzero) digits is 24696000, while the sum is 58.

The spelling of 16545720172765 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty million, one hundred seventy-two thousand, seven hundred sixty-five".