161744461505 has 16 divisors (see below), whose sum is σ = 222882321600. Its totient is φ = 111441159360.

The previous prime is 161744461481. The next prime is 161744461507. The reversal of 161744461505 is 505164447161.

It is not a de Polignac number, because 161744461505 - 2¹² = 161744457409 is a prime.

It is a super-2 number, since 2×161744461505² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161744461507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77388650 + ... + 77390739.

It is an arithmetic number, because the mean of its divisors is an integer number (13930145100).

Almost surely, 2^161744461505 is an apocalyptic number.

It is an amenable number.

161744461505 is a deficient number, since it is larger than the sum of its proper divisors (61137860095).

161744461505 is a wasteful number, since it uses less digits than its factorization.

161744461505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154779424.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 161744461505 in words is "one hundred sixty-one billion, seven hundred forty-four million, four hundred sixty-one thousand, five hundred five".