161723378485 has 8 divisors (see below), whose sum is σ = 194070389760. Its totient is φ = 129377145744.

The previous prime is 161723378353. The next prime is 161723378489. The reversal of 161723378485 is 584873327161.

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 161723378485 - 2¹⁹ = 161722854197 is a prime.

It is a super-2 number, since 2×161723378485² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161723378489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466596 + ... + 735634.

It is an arithmetic number, because the mean of its divisors is an integer number (24258798720).

Almost surely, 2^161723378485 is an apocalyptic number.

It is an amenable number.

161723378485 is a deficient number, since it is larger than the sum of its proper divisors (32347011275).

161723378485 is a wasteful number, since it uses less digits than its factorization.

161723378485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389267.

The product of its digits is 6773760, while the sum is 55.

The spelling of 161723378485 in words is "one hundred sixty-one billion, seven hundred twenty-three million, three hundred seventy-eight thousand, four hundred eighty-five".