65533253640 has 128 divisors (see below), whose sum is σ = 202452203520. Its totient is φ = 16959795200.

The previous prime is 65533253627. The next prime is 65533253657. The reversal of 65533253640 is 4635233556.

It is a junction number, because it is equal to n+sod(n) for n = 65533253592 and 65533253601.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 904852 + ... + 974588.

It is an arithmetic number, because the mean of its divisors is an integer number (1581657840).

Almost surely, 2^65533253640 is an apocalyptic number.

65533253640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65533253640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101226101760).

65533253640 is an abundant number, since it is smaller than the sum of its proper divisors (136918949880).

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

65533253640 is a wasteful number, since it uses less digits than its factorization.

65533253640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69983 (or 69979 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 42.

The spelling of 65533253640 in words is "sixty-five billion, five hundred thirty-three million, two hundred fifty-three thousand, six hundred forty".