144918631581 has 32 divisors (see below), whose sum is σ = 205071360000. Its totient is φ = 90775883520.

The previous prime is 144918631513. The next prime is 144918631589. The reversal of 144918631581 is 185136819441.

It is not a de Polignac number, because 144918631581 - 2¹³ = 144918623389 is a prime.

It is a super-2 number, since 2×144918631581² (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 (144918631589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3649170 + ... + 3688668.

It is an arithmetic number, because the mean of its divisors is an integer number (6408480000).

Almost surely, 2^144918631581 is an apocalyptic number.

It is an amenable number.

144918631581 is a deficient number, since it is larger than the sum of its proper divisors (60152728419).

144918631581 is a wasteful number, since it uses less digits than its factorization.

144918631581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40049.

The product of its digits is 829440, while the sum is 51.

The spelling of 144918631581 in words is "one hundred forty-four billion, nine hundred eighteen million, six hundred thirty-one thousand, five hundred eighty-one".