143661233551 has 16 divisors (see below), whose sum is σ = 158345575200. Its totient is φ = 129248784000.

The previous prime is 143661233537. The next prime is 143661233561. The reversal of 143661233551 is 155332166341.

143661233551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 143661233551 - 2³⁷ = 6222280079 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 (143661233561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2492365 + ... + 2549353.

It is an arithmetic number, because the mean of its divisors is an integer number (9896598450).

Almost surely, 2^143661233551 is an apocalyptic number.

143661233551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

143661233551 is a deficient number, since it is larger than the sum of its proper divisors (14684341649).

143661233551 is a wasteful number, since it uses less digits than its factorization.

143661233551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59370.

The product of its digits is 194400, while the sum is 40.

Adding to 143661233551 its reverse (155332166341), we get a palindrome (298993399892).

The spelling of 143661233551 in words is "one hundred forty-three billion, six hundred sixty-one million, two hundred thirty-three thousand, five hundred fifty-one".