64211661522 has 90 divisors (see below), whose sum is σ = 147624429447. Its totient is φ = 20860968744.

The previous prime is 64211661497. The next prime is 64211661539. The reversal of 64211661522 is 22516611246.

64211661522 is a `hidden beast` number, since 6 + 4 + 2 + 1 + 16 + 615 + 22 = 666.

64211661522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 32105830761 + 32105830761 = 179181^2 + 179181^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=179181.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 138685863 + ... + 138686325.

Almost surely, 2^64211661522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64211661522

64211661522 is an abundant number, since it is smaller than the sum of its proper divisors (83412767925).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64211661522 is an frugal number, since it uses more digits than its factorization.

64211661522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 511 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 64211661522 in words is "sixty-four billion, two hundred eleven million, six hundred sixty-one thousand, five hundred twenty-two".