661301756612 has 48 divisors (see below), whose sum is σ = 1341177207552. Its totient is φ = 279458588160.

The previous prime is 661301756611. The next prime is 661301756653. The reversal of 661301756612 is 216657103166.

It is not an unprimeable number, because it can be changed into a prime (661301756611) 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, 179912 + ... + 1164032.

It is an arithmetic number, because the mean of its divisors is an integer number (27941191824).

Almost surely, 2^661301756612 is an apocalyptic number.

It is an amenable number.

661301756612 is an abundant number, since it is smaller than the sum of its proper divisors (679875450940).

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

661301756612 is a wasteful number, since it uses less digits than its factorization.

661301756612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984468 (or 984466 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

Adding to 661301756612 its reverse (216657103166), we get a palindrome (877958859778).

The spelling of 661301756612 in words is "six hundred sixty-one billion, three hundred one million, seven hundred fifty-six thousand, six hundred twelve".