661773424377166 has 32 divisors (see below), whose sum is σ = 1012108955568480. Its totient is φ = 324466546231296.

The previous prime is 661773424377157. The next prime is 661773424377193.

661773424377166 is nontrivially palindromic in base 10.

661773424377166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 661773424377095 and 661773424377104.

It is a congruent number.

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, 1860183781 + ... + 1860539503.

It is an arithmetic number, because the mean of its divisors is an integer number (31628404861515).

Almost surely, 2^{661773424377166} is an apocalyptic number.

661773424377166 is a deficient number, since it is larger than the sum of its proper divisors (350335531191314).

661773424377166 is a wasteful number, since it uses less digits than its factorization.

661773424377166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443908.

The product of its digits is 896168448, while the sum is 70.

The spelling of 661773424377166 in words is "six hundred sixty-one trillion, seven hundred seventy-three billion, four hundred twenty-four million, three hundred seventy-seven thousand, one hundred sixty-six".