661230211362 has 128 divisors (see below), whose sum is σ = 1628970393600. Its totient is φ = 174628694016.

The previous prime is 661230211357. The next prime is 661230211403. The reversal of 661230211362 is 263112032166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 47553303 + ... + 47567205.

It is an arithmetic number, because the mean of its divisors is an integer number (12726331200).

Almost surely, 2^661230211362 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661230211362, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814485196800).

661230211362 is an abundant number, since it is smaller than the sum of its proper divisors (967740182238).

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

661230211362 is a wasteful number, since it uses less digits than its factorization.

661230211362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15120.

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 661230211362 in words is "six hundred sixty-one billion, two hundred thirty million, two hundred eleven thousand, three hundred sixty-two".