164973696397521 has 64 divisors (see below), whose sum is σ = 242387711483904. Its totient is φ = 98978690764800.

The previous prime is 164973696397373. The next prime is 164973696397681. The reversal of 164973696397521 is 125793696379461.

It is not a de Polignac number, because 164973696397521 - 2¹⁰ = 164973696396497 is a prime.

It is a super-2 number, since 2×164973696397521² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164973696397721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3594723451 + ... + 3594769343.

It is an arithmetic number, because the mean of its divisors is an integer number (3787307991936).

Almost surely, 2^{164973696397521} is an apocalyptic number.

164973696397521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

164973696397521 is a deficient number, since it is larger than the sum of its proper divisors (77414015086383).

164973696397521 is a wasteful number, since it uses less digits than its factorization.

164973696397521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48854.

The product of its digits is 2777664960, while the sum is 78.

The spelling of 164973696397521 in words is "one hundred sixty-four trillion, nine hundred seventy-three billion, six hundred ninety-six million, three hundred ninety-seven thousand, five hundred twenty-one".