661663365122 has 16 divisors (see below), whose sum is σ = 1059043025760. Its totient is φ = 309126069792.

The previous prime is 661663365091. The next prime is 661663365211. The reversal of 661663365122 is 221563366166.

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, 119258828 + ... + 119264375.

It is an arithmetic number, because the mean of its divisors is an integer number (66190189110).

Almost surely, 2^661663365122 is an apocalyptic number.

661663365122 is a deficient number, since it is larger than the sum of its proper divisors (397379660638).

661663365122 is a wasteful number, since it uses less digits than its factorization.

661663365122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238523297.

The product of its digits is 1399680, while the sum is 47.

The spelling of 661663365122 in words is "six hundred sixty-one billion, six hundred sixty-three million, three hundred sixty-five thousand, one hundred twenty-two".