144640656437 has 4 divisors (see below), whose sum is σ = 149306484096. Its totient is φ = 139974828780.

The previous prime is 144640656421. The next prime is 144640656443. The reversal of 144640656437 is 734656046441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 734656046441 = 31469 ⋅23345389.

It is a cyclic number.

It is not a de Polignac number, because 144640656437 - 2⁴ = 144640656421 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 (144640656467) 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, 2332913783 + ... + 2332913844.

It is an arithmetic number, because the mean of its divisors is an integer number (37326621024).

Almost surely, 2^144640656437 is an apocalyptic number.

It is an amenable number.

144640656437 is a deficient number, since it is larger than the sum of its proper divisors (4665827659).

144640656437 is an equidigital number, since it uses as much as digits as its factorization.

144640656437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665827658.

The product of its (nonzero) digits is 5806080, while the sum is 50.

The spelling of 144640656437 in words is "one hundred forty-four billion, six hundred forty million, six hundred fifty-six thousand, four hundred thirty-seven".