164547663021 has 24 divisors (see below), whose sum is σ = 271774963200. Its totient is φ = 93978523296.

The previous prime is 164547662971. The next prime is 164547663041. The reversal of 164547663021 is 120366745461.

164547663021 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 4 + 7 + 6 + 630 + 2 + 1 = 666.

It is not a de Polignac number, because 164547663021 - 2⁶ = 164547662957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164547663041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 553821 + ... + 797378.

It is an arithmetic number, because the mean of its divisors is an integer number (11323956800).

Almost surely, 2^164547663021 is an apocalyptic number.

It is an amenable number.

164547663021 is a deficient number, since it is larger than the sum of its proper divisors (107227300179).

164547663021 is a wasteful number, since it uses less digits than its factorization.

164547663021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353145 (or 1353142 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 164547663021 in words is "one hundred sixty-four billion, five hundred forty-seven million, six hundred sixty-three thousand, twenty-one".