161217808153 has 4 divisors (see below), whose sum is σ = 161225360640. Its totient is φ = 161210255668.

The previous prime is 161217808151. The next prime is 161217808159. The reversal of 161217808153 is 351808712161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 351808712161 = 12377 ⋅28424393.

It is a cyclic number.

It is not a de Polignac number, because 161217808153 - 2¹ = 161217808151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161217808151) 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, 3744133 + ... + 3786946.

It is an arithmetic number, because the mean of its divisors is an integer number (40306340160).

Almost surely, 2^161217808153 is an apocalyptic number.

It is an amenable number.

161217808153 is a deficient number, since it is larger than the sum of its proper divisors (7552487).

161217808153 is an equidigital number, since it uses as much as digits as its factorization.

161217808153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552486.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 161217808153 in words is "one hundred sixty-one billion, two hundred seventeen million, eight hundred eight thousand, one hundred fifty-three".