143661973693 has 4 divisors (see below), whose sum is σ = 164185112800. Its totient is φ = 123138834588.

The previous prime is 143661973619. The next prime is 143661973717. The reversal of 143661973693 is 396379166341.

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.

It is not a de Polignac number, because 143661973693 - 2²⁵ = 143628419261 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 (143661971693) 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, 10261569543 + ... + 10261569556.

It is an arithmetic number, because the mean of its divisors is an integer number (41046278200).

Almost surely, 2^143661973693 is an apocalyptic number.

It is an amenable number.

143661973693 is a deficient number, since it is larger than the sum of its proper divisors (20523139107).

143661973693 is an equidigital number, since it uses as much as digits as its factorization.

143661973693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523139106.

The product of its digits is 13226976, while the sum is 58.

The spelling of 143661973693 in words is "one hundred forty-three billion, six hundred sixty-one million, nine hundred seventy-three thousand, six hundred ninety-three".