161566012227299 has 16 divisors (see below), whose sum is σ = 165151225393440. Its totient is φ = 158028441177600.

The previous prime is 161566012227251. The next prime is 161566012227343. The reversal of 161566012227299 is 992722210665161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161566012227299 is a prime.

It is a super-2 number, since 2×161566012227299² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161566012227899) 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 15 ways as a sum of consecutive naturals, for example, 18064169 + ... + 25484234.

It is an arithmetic number, because the mean of its divisors is an integer number (10321951587090).

Almost surely, 2^{161566012227299} is an apocalyptic number.

161566012227299 is a deficient number, since it is larger than the sum of its proper divisors (3585213166141).

161566012227299 is a wasteful number, since it uses less digits than its factorization.

161566012227299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43548950.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 161566012227299 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, twelve million, two hundred twenty-seven thousand, two hundred ninety-nine".