661354453166 has 96 divisors (see below), whose sum is σ = 1192635722880. Its totient is φ = 272004955200.

The previous prime is 661354453157. The next prime is 661354453169.

661354453166 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661354453169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 181539341 + ... + 181542983.

It is an arithmetic number, because the mean of its divisors is an integer number (12423288780).

Almost surely, 2^661354453166 is an apocalyptic number.

661354453166 is a deficient number, since it is larger than the sum of its proper divisors (531281269714).

661354453166 is a wasteful number, since it uses less digits than its factorization.

661354453166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542 (or 4519 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 50.

The spelling of 661354453166 in words is "six hundred sixty-one billion, three hundred fifty-four million, four hundred fifty-three thousand, one hundred sixty-six".