64535213252 has 6 divisors (see below), whose sum is σ = 112936623198. Its totient is φ = 32267606624.

The previous prime is 64535213243. The next prime is 64535213273. The reversal of 64535213252 is 25231253546.

It can be written as a sum of positive squares in only one way, i.e., 51323090116 + 13212123136 = 226546^2 + 114944^2 .

It is a super-2 number, since 2×64535213252² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8066901653 + ... + 8066901660.

It is an arithmetic number, because the mean of its divisors is an integer number (18822770533).

Almost surely, 2^64535213252 is an apocalyptic number.

It is an amenable number.

64535213252 is a deficient number, since it is larger than the sum of its proper divisors (48401409946).

64535213252 is a wasteful number, since it uses less digits than its factorization.

64535213252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16133803317 (or 16133803315 counting only the distinct ones).

The product of its digits is 216000, while the sum is 38.

Adding to 64535213252 its reverse (25231253546), we get a palindrome (89766466798).

The spelling of 64535213252 in words is "sixty-four billion, five hundred thirty-five million, two hundred thirteen thousand, two hundred fifty-two".