166440044661 has 32 divisors (see below), whose sum is σ = 243901075968. Its totient is φ = 100121461440.

The previous prime is 166440044647. The next prime is 166440044689.

166440044661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166440044661 - 2⁹ = 166440044149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166440044611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4889446 + ... + 4923368.

It is an arithmetic number, because the mean of its divisors is an integer number (7621908624).

Almost surely, 2^166440044661 is an apocalyptic number.

166440044661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166440044661 is a deficient number, since it is larger than the sum of its proper divisors (77461031307).

166440044661 is a wasteful number, since it uses less digits than its factorization.

166440044661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35041.

The product of its (nonzero) digits is 331776, while the sum is 42.

The spelling of 166440044661 in words is "one hundred sixty-six billion, four hundred forty million, forty-four thousand, six hundred sixty-one".