161506494275 has 24 divisors (see below), whose sum is σ = 230524412160. Its totient is φ = 109950550560.

The previous prime is 161506494271. The next prime is 161506494307. The reversal of 161506494275 is 572494605161.

It is not a de Polignac number, because 161506494275 - 2² = 161506494271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161506494271) 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 23 ways as a sum of consecutive naturals, for example, 3295439 + ... + 3344088.

It is an arithmetic number, because the mean of its divisors is an integer number (9605183840).

Almost surely, 2^161506494275 is an apocalyptic number.

161506494275 is a deficient number, since it is larger than the sum of its proper divisors (69017917885).

161506494275 is a wasteful number, since it uses less digits than its factorization.

161506494275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6639683 (or 6639678 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 161506494275 in words is "one hundred sixty-one billion, five hundred six million, four hundred ninety-four thousand, two hundred seventy-five".