661316484832 has 96 divisors (see below), whose sum is σ = 1410155163648. Its totient is φ = 304146855936.

The previous prime is 661316484827. The next prime is 661316484929. The reversal of 661316484832 is 238484613166.

It is a super-2 number, since 2×661316484832² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661316484832.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4557463 + ... + 4700329.

It is an arithmetic number, because the mean of its divisors is an integer number (14689116288).

Almost surely, 2^661316484832 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 661316484832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705077581824).

661316484832 is an abundant number, since it is smaller than the sum of its proper divisors (748838678816).

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

661316484832 is a wasteful number, since it uses less digits than its factorization.

661316484832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143088 (or 143080 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The spelling of 661316484832 in words is "six hundred sixty-one billion, three hundred sixteen million, four hundred eighty-four thousand, eight hundred thirty-two".