161551100155 has 8 divisors (see below), whose sum is σ = 195341178384. Its totient is φ = 128254308000.

The previous prime is 161551100129. The next prime is 161551100167. The reversal of 161551100155 is 551001155161.

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

It is not a de Polignac number, because 161551100155 - 2²⁵ = 161517545723 is a prime.

It is a super-2 number, since 2×161551100155² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123320796 + ... + 123322105.

It is an arithmetic number, because the mean of its divisors is an integer number (24417647298).

Almost surely, 2^161551100155 is an apocalyptic number.

161551100155 is a deficient number, since it is larger than the sum of its proper divisors (33790078229).

161551100155 is a wasteful number, since it uses less digits than its factorization.

161551100155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246643037.

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 161551100155 in words is "one hundred sixty-one billion, five hundred fifty-one million, one hundred thousand, one hundred fifty-five".