661454606454166 has 32 divisors (see below), whose sum is σ = 1135077379672320. Its totient is φ = 283191755289696.

The previous prime is 661454606454157. The next prime is 661454606454179.

661454606454166 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 661454606454098 and 661454606454107.

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, 978662341 + ... + 979337983.

It is an arithmetic number, because the mean of its divisors is an integer number (35471168114760).

Almost surely, 2^{661454606454166} is an apocalyptic number.

661454606454166 is a deficient number, since it is larger than the sum of its proper divisors (473622773218154).

661454606454166 is a wasteful number, since it uses less digits than its factorization.

661454606454166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746788.

The product of its (nonzero) digits is 298598400, while the sum is 64.

The spelling of 661454606454166 in words is "six hundred sixty-one trillion, four hundred fifty-four billion, six hundred six million, four hundred fifty-four thousand, one hundred sixty-six".