16165156561601 has 4 divisors (see below), whose sum is σ = 16392834823104. Its totient is φ = 15937478300100.

The previous prime is 16165156561597. The next prime is 16165156561627. The reversal of 16165156561601 is 10616565156161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16165156561601 - 2² = 16165156561597 is a prime.

It is a super-2 number, since 2×16165156561601² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16165156561601.

It is not an unprimeable number, because it can be changed into a prime (16165156561691) 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 3 ways as a sum of consecutive naturals, for example, 113839130645 + ... + 113839130786.

It is an arithmetic number, because the mean of its divisors is an integer number (4098208705776).

Almost surely, 2^{16165156561601} is an apocalyptic number.

It is an amenable number.

16165156561601 is a deficient number, since it is larger than the sum of its proper divisors (227678261503).

16165156561601 is an equidigital number, since it uses as much as digits as its factorization.

16165156561601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227678261502.

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 16165156561601 in words is "sixteen trillion, one hundred sixty-five billion, one hundred fifty-six million, five hundred sixty-one thousand, six hundred one".