166697954453 has 4 divisors (see below), whose sum is σ = 166976248800. Its totient is φ = 166419660108.

The previous prime is 166697954441. The next prime is 166697954491. The reversal of 166697954453 is 354459796661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166697954453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166697954453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166697954653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139146275 + ... + 139147472.

It is an arithmetic number, because the mean of its divisors is an integer number (41744062200).

Almost surely, 2^166697954453 is an apocalyptic number.

It is an amenable number.

166697954453 is a deficient number, since it is larger than the sum of its proper divisors (278294347).

166697954453 is an equidigital number, since it uses as much as digits as its factorization.

166697954453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278294346.

The product of its digits is 146966400, while the sum is 65.

The spelling of 166697954453 in words is "one hundred sixty-six billion, six hundred ninety-seven million, nine hundred fifty-four thousand, four hundred fifty-three".