161223654045 has 16 divisors (see below), whose sum is σ = 264249502272. Its totient is φ = 83888730240.

The previous prime is 161223654043. The next prime is 161223654049. The reversal of 161223654045 is 540456322161.

It is not a de Polignac number, because 161223654045 - 2¹ = 161223654043 is a prime.

It is a super-3 number, since 3×161223654045³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161223653994 and 161223654012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161223654043) 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, 131075527 + ... + 131076756.

It is an arithmetic number, because the mean of its divisors is an integer number (16515593892).

Almost surely, 2^161223654045 is an apocalyptic number.

161223654045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161223654045 is a deficient number, since it is larger than the sum of its proper divisors (103025848227).

161223654045 is a wasteful number, since it uses less digits than its factorization.

161223654045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262152332.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 161223654045 in words is "one hundred sixty-one billion, two hundred twenty-three million, six hundred fifty-four thousand, forty-five".