661111224672 has 48 divisors (see below), whose sum is σ = 1735504090992. Its totient is φ = 220359344640.

The previous prime is 661111224667. The next prime is 661111224689. The reversal of 661111224672 is 276422111166.

661111224672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 661111224672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1874958 + ... + 2199474.

It is an arithmetic number, because the mean of its divisors is an integer number (36156335229).

Almost surely, 2^661111224672 is an apocalyptic number.

It is an amenable number.

661111224672 is an abundant number, since it is smaller than the sum of its proper divisors (1074392866320).

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

661111224672 is a wasteful number, since it uses less digits than its factorization.

661111224672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345751 (or 345743 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The spelling of 661111224672 in words is "six hundred sixty-one billion, one hundred eleven million, two hundred twenty-four thousand, six hundred seventy-two".