16551765004405 has 16 divisors (see below), whose sum is σ = 19909946577024. Its totient is φ = 13209528346560.

The previous prime is 16551765004381. The next prime is 16551765004409. The reversal of 16551765004405 is 50440056715561.

It is not a de Polignac number, because 16551765004405 - 2¹³ = 16551764996213 is a prime.

It is a super-2 number, since 2×16551765004405² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551765004409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74707402 + ... + 74928628.

It is an arithmetic number, because the mean of its divisors is an integer number (1244371661064).

Almost surely, 2^{16551765004405} is an apocalyptic number.

It is an amenable number.

16551765004405 is a deficient number, since it is larger than the sum of its proper divisors (3358181572619).

16551765004405 is a wasteful number, since it uses less digits than its factorization.

16551765004405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257196.

The product of its (nonzero) digits is 2520000, while the sum is 49.

The spelling of 16551765004405 in words is "sixteen trillion, five hundred fifty-one billion, seven hundred sixty-five million, four thousand, four hundred five".