653061231440 has 80 divisors (see below), whose sum is σ = 1610482547520. Its totient is φ = 245586631680.

The previous prime is 653061231419. The next prime is 653061231443. The reversal of 653061231440 is 44132160356.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 653061231440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653061231443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440749 + ... + 1838988.

It is an arithmetic number, because the mean of its divisors is an integer number (20131031844).

Almost surely, 2^653061231440 is an apocalyptic number.

It is an amenable number.

653061231440 is an abundant number, since it is smaller than the sum of its proper divisors (957421316080).

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

653061231440 is a wasteful number, since it uses less digits than its factorization.

653061231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279900 (or 3279894 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 653061231440 its reverse (44132160356), we get a palindrome (697193391796).

The spelling of 653061231440 in words is "six hundred fifty-three billion, sixty-one million, two hundred thirty-one thousand, four hundred forty".