64651210521 has 8 divisors (see below), whose sum is σ = 86859642144. Its totient is φ = 42771792960.

The previous prime is 64651210433. The next prime is 64651210549. The reversal of 64651210521 is 12501215646.

64651210521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64651210521 - 2¹¹ = 64651208473 is a prime.

It is a super-2 number, since 2×64651210521² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64651210621) 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, 82253056 + ... + 82253841.

It is an arithmetic number, because the mean of its divisors is an integer number (10857455268).

Almost surely, 2^64651210521 is an apocalyptic number.

It is an amenable number.

64651210521 is a deficient number, since it is larger than the sum of its proper divisors (22208431623).

64651210521 is a wasteful number, since it uses less digits than its factorization.

64651210521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164507031.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 64651210521 in words is "sixty-four billion, six hundred fifty-one million, two hundred ten thousand, five hundred twenty-one".