661754565457166 has 8 divisors (see below), whose sum is σ = 1002459886286904. Its totient is φ = 327601270028200.

The previous prime is 661754565457147. The next prime is 661754565457199.

661754565457166 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 661754565457093 and 661754565457102.

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 3 ways as a sum of consecutive naturals, for example, 1638006349940 + ... + 1638006350343.

It is an arithmetic number, because the mean of its divisors is an integer number (125307485785863).

Almost surely, 2^{661754565457166} is an apocalyptic number.

661754565457166 is a deficient number, since it is larger than the sum of its proper divisors (340705320829738).

661754565457166 is a wasteful number, since it uses less digits than its factorization.

661754565457166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276012700386.

The product of its digits is 3810240000, while the sum is 74.

The spelling of 661754565457166 in words is "six hundred sixty-one trillion, seven hundred fifty-four billion, five hundred sixty-five million, four hundred fifty-seven thousand, one hundred sixty-six".