161506003 has 6 divisors (see below), whose sum is σ = 163754124. Its totient is φ = 159288336.

The previous prime is 161505997. The next prime is 161506013. The reversal of 161506003 is 300605161.

It is a de Polignac number, because none of the positive numbers 2^k-161506003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161506013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9825 + ... + 20482.

It is an arithmetic number, because the mean of its divisors is an integer number (27292354).

Almost surely, 2^161506003 is an apocalyptic number.

161506003 is a deficient number, since it is larger than the sum of its proper divisors (2248121).

161506003 is an frugal number, since it uses more digits than its factorization.

161506003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30453 (or 30380 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 161506003 is about 12708.5012098201. The cubic root of 161506003 is about 544.5815074218.

The spelling of 161506003 in words is "one hundred sixty-one million, five hundred six thousand, three".