164647456150221 has 18 divisors (see below), whose sum is σ = 261409964816910. Its totient is φ = 99786337060080.

The previous prime is 164647456150183. The next prime is 164647456150223. The reversal of 164647456150221 is 122051654746461.

164647456150221 is a `hidden beast` number, since 1 + 6 + 4 + 6 + 4 + 7 + 4 + 561 + 50 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 164521795826025 + 125660324196 = 12826605^2 + 354486^2 .

It is not a de Polignac number, because 164647456150221 - 2¹¹ = 164647456148173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164647456150223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 75595708806 + ... + 75595710983.

Almost surely, 2^{164647456150221} is an apocalyptic number.

164647456150221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

164647456150221 is a deficient number, since it is larger than the sum of its proper divisors (96762508666689).

164647456150221 is a wasteful number, since it uses less digits than its factorization.

164647456150221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151191419817 (or 151191419803 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 164647456150221 in words is "one hundred sixty-four trillion, six hundred forty-seven billion, four hundred fifty-six million, one hundred fifty thousand, two hundred twenty-one".