161556006110529 has 4 divisors (see below), whose sum is σ = 215408008147376. Its totient is φ = 107704004073684.

The previous prime is 161556006110467. The next prime is 161556006110591. The reversal of 161556006110529 is 925011600655161.

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 an interprime number because it is at equal distance from previous prime (161556006110467) and next prime (161556006110591).

It is not a de Polignac number, because 161556006110529 - 2¹¹ = 161556006108481 is a prime.

It is a super-2 number, since 2×161556006110529² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161556006110929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26926001018419 + ... + 26926001018424.

It is an arithmetic number, because the mean of its divisors is an integer number (53852002036844).

Almost surely, 2^{161556006110529} is an apocalyptic number.

It is an amenable number.

161556006110529 is a deficient number, since it is larger than the sum of its proper divisors (53852002036847).

161556006110529 is an equidigital number, since it uses as much as digits as its factorization.

161556006110529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53852002036846.

The product of its (nonzero) digits is 486000, while the sum is 48.

The spelling of 161556006110529 in words is "one hundred sixty-one trillion, five hundred fifty-six billion, six million, one hundred ten thousand, five hundred twenty-nine".