661614513444 has 72 divisors (see below), whose sum is σ = 1684965004632. Its totient is φ = 218889216000.

The previous prime is 661614513409. The next prime is 661614513451. The reversal of 661614513444 is 444315416166.

661614513444 is a `hidden beast` number, since 6 + 6 + 161 + 45 + 1 + 3 + 444 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12561926400 + 649052587044 = 112080^2 + 805638^2 .

It is a super-2 number, since 2×661614513444² (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 661614513444.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2499444 + ... + 2751444.

It is an arithmetic number, because the mean of its divisors is an integer number (23402291731).

Almost surely, 2^661614513444 is an apocalyptic number.

It is an amenable number.

661614513444 is an abundant number, since it is smaller than the sum of its proper divisors (1023350491188).

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

661614513444 is a wasteful number, since it uses less digits than its factorization.

661614513444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252557 (or 252552 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 661614513444 in words is "six hundred sixty-one billion, six hundred fourteen million, five hundred thirteen thousand, four hundred forty-four".