65843671421 has 16 divisors (see below), whose sum is σ = 71950049280. Its totient is φ = 59757502320.

The previous prime is 65843671409. The next prime is 65843671457. The reversal of 65843671421 is 12417634856.

It is a cyclic number.

It is not a de Polignac number, because 65843671421 - 2³⁴ = 48663802237 is a prime.

It is a super-2 number, since 2×65843671421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65843671021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31915436 + ... + 31917498.

It is an arithmetic number, because the mean of its divisors is an integer number (4496878080).

Almost surely, 2^65843671421 is an apocalyptic number.

It is an amenable number.

65843671421 is a deficient number, since it is larger than the sum of its proper divisors (6106377859).

65843671421 is a wasteful number, since it uses less digits than its factorization.

65843671421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536.

The product of its digits is 967680, while the sum is 47.

The spelling of 65843671421 in words is "sixty-five billion, eight hundred forty-three million, six hundred seventy-one thousand, four hundred twenty-one".