155221560161 has 8 divisors (see below), whose sum is σ = 155901383424. Its totient is φ = 154543217760.

The previous prime is 155221560107. The next prime is 155221560191. The reversal of 155221560161 is 161065122551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155221560161 - 2³⁴ = 138041690977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155221560191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159860 + ... + 579653.

It is an arithmetic number, because the mean of its divisors is an integer number (19487672928).

Almost surely, 2^155221560161 is an apocalyptic number.

It is an amenable number.

155221560161 is a deficient number, since it is larger than the sum of its proper divisors (679823263).

155221560161 is an equidigital number, since it uses as much as digits as its factorization.

155221560161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740431.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 155221560161 in words is "one hundred fifty-five billion, two hundred twenty-one million, five hundred sixty thousand, one hundred sixty-one".