661066511106 has 32 divisors (see below), whose sum is σ = 1388876284800. Its totient is φ = 209360226944.

The previous prime is 661066511071. The next prime is 661066511141. The reversal of 661066511106 is 601115660166.

It is an interprime number because it is at equal distance from previous prime (661066511071) and next prime (661066511141).

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, 16054395 + ... + 16095518.

It is an arithmetic number, because the mean of its divisors is an integer number (43402383900).

Almost surely, 2^661066511106 is an apocalyptic number.

661066511106 is an abundant number, since it is smaller than the sum of its proper divisors (727809773694).

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

661066511106 is a wasteful number, since it uses less digits than its factorization.

661066511106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32150090.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 661066511106 in words is "six hundred sixty-one billion, sixty-six million, five hundred eleven thousand, one hundred six".