661943722 has 32 divisors (see below), whose sum is σ = 1155358080. Its totient is φ = 281095680.

The previous prime is 661943701. The next prime is 661943747. The reversal of 661943722 is 227349166.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 44779 + ... + 57697.

It is an arithmetic number, because the mean of its divisors is an integer number (36104940).

Almost surely, 2^661943722 is an apocalyptic number.

661943722 is a deficient number, since it is larger than the sum of its proper divisors (493414358).

661943722 is a wasteful number, since it uses less digits than its factorization.

661943722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13086.

The product of its digits is 108864, while the sum is 40.

The square root of 661943722 is about 25728.2669840003. The cubic root of 661943722 is about 871.5126378069.

The spelling of 661943722 in words is "six hundred sixty-one million, nine hundred forty-three thousand, seven hundred twenty-two".