9966143541 has 4 divisors (see below), whose sum is σ = 13288191392. Its totient is φ = 6644095692.

The previous prime is 9966143527. The next prime is 9966143557. The reversal of 9966143541 is 1453416699.

It is a happy number.

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 9966143541 - 2⁷ = 9966143413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966143581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661023921 + ... + 1661023926.

It is an arithmetic number, because the mean of its divisors is an integer number (3322047848).

Almost surely, 2^9966143541 is an apocalyptic number.

It is an amenable number.

9966143541 is a deficient number, since it is larger than the sum of its proper divisors (3322047851).

9966143541 is a wasteful number, since it uses less digits than its factorization.

9966143541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322047850.

The product of its digits is 699840, while the sum is 48.

The square root of 9966143541 is about 99830.5741794567. The cubic root of 9966143541 is about 2152.0005565986. Note that the first 3 decimals are identical.

The spelling of 9966143541 in words is "nine billion, nine hundred sixty-six million, one hundred forty-three thousand, five hundred forty-one".