161211112603 has 8 divisors (see below), whose sum is σ = 164794360640. Its totient is φ = 157662485640.

The previous prime is 161211112583. The next prime is 161211112669. The reversal of 161211112603 is 306211112161.

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 161211112603 - 2⁹ = 161211112091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161211112003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8645853 + ... + 8664478.

It is an arithmetic number, because the mean of its divisors is an integer number (20599295080).

Almost surely, 2^161211112603 is an apocalyptic number.

161211112603 is a deficient number, since it is larger than the sum of its proper divisors (3583248037).

161211112603 is a wasteful number, since it uses less digits than its factorization.

161211112603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17310537.

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 161211112603 its reverse (306211112161), we get a palindrome (467422224764).

The spelling of 161211112603 in words is "one hundred sixty-one billion, two hundred eleven million, one hundred twelve thousand, six hundred three".