161746785503 has 4 divisors (see below), whose sum is σ = 161748454728. Its totient is φ = 161745116280.

The previous prime is 161746785479. The next prime is 161746785539. The reversal of 161746785503 is 305587647161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161746785503 - 2⁶ = 161746785439 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 (161746785553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679676 + ... + 886257.

It is an arithmetic number, because the mean of its divisors is an integer number (40437113682).

Almost surely, 2^161746785503 is an apocalyptic number.

161746785503 is a deficient number, since it is larger than the sum of its proper divisors (1669225).

161746785503 is a wasteful number, since it uses less digits than its factorization.

161746785503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669224.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 161746785503 in words is "one hundred sixty-one billion, seven hundred forty-six million, seven hundred eighty-five thousand, five hundred three".