161900255 has 8 divisors (see below), whose sum is σ = 211942224. Its totient is φ = 117745600.

The previous prime is 161900251. The next prime is 161900257. The reversal of 161900255 is 552009161.

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

It is not a de Polignac number, because 161900255 - 2² = 161900251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161900251) 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, 1471766 + ... + 1471875.

It is an arithmetic number, because the mean of its divisors is an integer number (26492778).

Almost surely, 2^161900255 is an apocalyptic number.

161900255 is a deficient number, since it is larger than the sum of its proper divisors (50041969).

161900255 is a wasteful number, since it uses less digits than its factorization.

161900255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943657.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 161900255 is about 12724.0031043693. The cubic root of 161900255 is about 545.0242729699.

The spelling of 161900255 in words is "one hundred sixty-one million, nine hundred thousand, two hundred fifty-five".