661441664143206 has 24 divisors (see below), whose sum is σ = 1436042391010344. Its totient is φ = 220031510811840.

The previous prime is 661441664143103. The next prime is 661441664143219. The reversal of 661441664143206 is 602341466144166.

661441664143206 is a `hidden beast` number, since 6 + 6 + 1 + 4 + 4 + 16 + 6 + 414 + 3 + 206 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37420316131 + ... + 37420333806.

It is an arithmetic number, because the mean of its divisors is an integer number (59835099625431).

Almost surely, 2^{661441664143206} is an apocalyptic number.

661441664143206 is an abundant number, since it is smaller than the sum of its proper divisors (774600726867138).

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

661441664143206 is a wasteful number, since it uses less digits than its factorization.

661441664143206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74840650436 (or 74840650433 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 54.

The spelling of 661441664143206 in words is "six hundred sixty-one trillion, four hundred forty-one billion, six hundred sixty-four million, one hundred forty-three thousand, two hundred six".