166206056451 has 8 divisors (see below), whose sum is σ = 221670147264. Its totient is φ = 110773001640.

The previous prime is 166206056383. The next prime is 166206056503. The reversal of 166206056451 is 154650602661.

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

It is not a de Polignac number, because 166206056451 - 2¹¹ = 166206054403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166206056651) 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, 7746501 + ... + 7767926.

It is an arithmetic number, because the mean of its divisors is an integer number (27708768408).

Almost surely, 2^166206056451 is an apocalyptic number.

166206056451 is a deficient number, since it is larger than the sum of its proper divisors (55464090813).

166206056451 is a wasteful number, since it uses less digits than its factorization.

166206056451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15518001.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 166206056451 in words is "one hundred sixty-six billion, two hundred six million, fifty-six thousand, four hundred fifty-one".