64156404021 has 8 divisors (see below), whose sum is σ = 86388821664. Its totient is φ = 42347461200.

The previous prime is 64156404007. The next prime is 64156404029. The reversal of 64156404021 is 12040465146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64156404021 - 2¹¹ = 64156401973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64156404029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105868351 + ... + 105868956.

It is an arithmetic number, because the mean of its divisors is an integer number (10798602708).

Almost surely, 2^64156404021 is an apocalyptic number.

It is an amenable number.

64156404021 is a deficient number, since it is larger than the sum of its proper divisors (22232417643).

64156404021 is a wasteful number, since it uses less digits than its factorization.

64156404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211737411.

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 64156404021 its reverse (12040465146), we get a palindrome (76196869167).

The spelling of 64156404021 in words is "sixty-four billion, one hundred fifty-six million, four hundred four thousand, twenty-one".