166421630023655 has 8 divisors (see below), whose sum is σ = 199708470648432. Its totient is φ = 133135627605568.

The previous prime is 166421630023591. The next prime is 166421630023657. The reversal of 166421630023655 is 556320036124661.

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 166421630023655 - 2⁶ = 166421630023591 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 (166421630023657) 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, 209114789 + ... + 209909118.

It is an arithmetic number, because the mean of its divisors is an integer number (24963558831054).

Almost surely, 2^{166421630023655} is an apocalyptic number.

166421630023655 is a deficient number, since it is larger than the sum of its proper divisors (33286840624777).

166421630023655 is an equidigital number, since it uses as much as digits as its factorization.

166421630023655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419103345.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 166421630023655 in words is "one hundred sixty-six trillion, four hundred twenty-one billion, six hundred thirty million, twenty-three thousand, six hundred fifty-five".