166440311564501 has 8 divisors (see below), whose sum is σ = 179250752520504. Its totient is φ = 153630919189440.

The previous prime is 166440311564477. The next prime is 166440311564521. The reversal of 166440311564501 is 105465113044661.

It is a happy number.

166440311564501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5390759883601 + 161049551680900 = 2321801^2 + 12690530^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 166440311564501 - 2³⁰ = 166439237822677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166440311564521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261815546 + ... + 262450491.

It is an arithmetic number, because the mean of its divisors is an integer number (22406344065063).

Almost surely, 2^{166440311564501} is an apocalyptic number.

It is an amenable number.

166440311564501 is a deficient number, since it is larger than the sum of its proper divisors (12810440956003).

166440311564501 is a wasteful number, since it uses less digits than its factorization.

166440311564501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524290471.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 166440311564501 in words is "one hundred sixty-six trillion, four hundred forty billion, three hundred eleven million, five hundred sixty-four thousand, five hundred one".