661733545337166 has 64 divisors (see below), whose sum is σ = 1372895468099136. Its totient is φ = 212460224256000.

The previous prime is 661733545337099. The next prime is 661733545337201.

661733545337166 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 661733545337097 and 661733545337106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151049956 + ... + 155369096.

It is an arithmetic number, because the mean of its divisors is an integer number (21451491689049).

Almost surely, 2^{661733545337166} is an apocalyptic number.

661733545337166 is an abundant number, since it is smaller than the sum of its proper divisors (711161922761970).

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

661733545337166 is a wasteful number, since it uses less digits than its factorization.

661733545337166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326117.

The product of its digits is 514382400, while the sum is 66.

The spelling of 661733545337166 in words is "six hundred sixty-one trillion, seven hundred thirty-three billion, five hundred forty-five million, three hundred thirty-seven thousand, one hundred sixty-six".