64835729421 has 32 divisors (see below), whose sum is σ = 88672483200. Its totient is φ = 42127755264.

The previous prime is 64835729419. The next prime is 64835729437. The reversal of 64835729421 is 12492753846.

It is not a de Polignac number, because 64835729421 - 2¹ = 64835729419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64835799421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8632950 + ... + 8640456.

It is an arithmetic number, because the mean of its divisors is an integer number (2771015100).

Almost surely, 2^64835729421 is an apocalyptic number.

It is an amenable number.

64835729421 is a deficient number, since it is larger than the sum of its proper divisors (23836753779).

64835729421 is a wasteful number, since it uses less digits than its factorization.

64835729421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045.

The product of its digits is 2903040, while the sum is 51.

The spelling of 64835729421 in words is "sixty-four billion, eight hundred thirty-five million, seven hundred twenty-nine thousand, four hundred twenty-one".