661452250112 has 44 divisors (see below), whose sum is σ = 1322978228880. Its totient is φ = 330546118656.

The previous prime is 661452250111. The next prime is 661452250127. The reversal of 661452250112 is 211052254166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661452250111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1716464 + ... + 2066192.

It is an arithmetic number, because the mean of its divisors is an integer number (30067687020).

Almost surely, 2^661452250112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661452250112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (661489114440).

661452250112 is an abundant number, since it is smaller than the sum of its proper divisors (661525978768).

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

661452250112 is a wasteful number, since it uses less digits than its factorization.

661452250112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351596 (or 351578 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 661452250112 in words is "six hundred sixty-one billion, four hundred fifty-two million, two hundred fifty thousand, one hundred twelve".