166155225036623 has 4 divisors (see below), whose sum is σ = 166155250828080. Its totient is φ = 166155199245168.

The previous prime is 166155225036583. The next prime is 166155225036673. The reversal of 166155225036623 is 326630522551661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 166155225036623 - 2¹⁸ = 166155224774479 is a prime.

It is a super-2 number, since 2×166155225036623² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166155225036673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5877518 + ... + 19153476.

It is an arithmetic number, because the mean of its divisors is an integer number (41538812707020).

Almost surely, 2^{166155225036623} is an apocalyptic number.

166155225036623 is a deficient number, since it is larger than the sum of its proper divisors (25791457).

166155225036623 is a wasteful number, since it uses less digits than its factorization.

166155225036623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25791456.

The product of its (nonzero) digits is 11664000, while the sum is 53.

The spelling of 166155225036623 in words is "one hundred sixty-six trillion, one hundred fifty-five billion, two hundred twenty-five million, thirty-six thousand, six hundred twenty-three".