661530240312 has 64 divisors (see below), whose sum is σ = 1689182208000. Its totient is φ = 215796804480.

The previous prime is 661530240247. The next prime is 661530240317. The reversal of 661530240312 is 213042035166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661530240317) 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, 14414362 + ... + 14460182.

It is an arithmetic number, because the mean of its divisors is an integer number (26393472000).

Almost surely, 2^661530240312 is an apocalyptic number.

It is an amenable number.

661530240312 is an abundant number, since it is smaller than the sum of its proper divisors (1027651967688).

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

661530240312 is a wasteful number, since it uses less digits than its factorization.

661530240312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58676 (or 58672 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 661530240312 its reverse (213042035166), we get a palindrome (874572275478).

The spelling of 661530240312 in words is "six hundred sixty-one billion, five hundred thirty million, two hundred forty thousand, three hundred twelve".