661022366166 has 64 divisors (see below), whose sum is σ = 1558751117760. Its totient is φ = 206925649920.

The previous prime is 661022366153. The next prime is 661022366231. The reversal of 661022366166 is 661663220166.

661022366166 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 2 + 23 + 6 + 616 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368295 + ... + 1207346.

It is an arithmetic number, because the mean of its divisors is an integer number (24355486215).

Almost surely, 2^661022366166 is an apocalyptic number.

661022366166 is an abundant number, since it is smaller than the sum of its proper divisors (897728751594).

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

661022366166 is a wasteful number, since it uses less digits than its factorization.

661022366166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576126 (or 1576120 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 661022366166 in words is "six hundred sixty-one billion, twenty-two million, three hundred sixty-six thousand, one hundred sixty-six".