164634785993 has 8 divisors (see below), whose sum is σ = 167812115016. Its totient is φ = 161482377600.

The previous prime is 164634785983. The next prime is 164634785999. The reversal of 164634785993 is 399587436461.

It can be written as a sum of positive squares in 4 ways, for example, as 100489 + 164634685504 = 317^2 + 405752^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 164634785993 - 2⁴ = 164634785977 is a prime.

It is a super-2 number, since 2×164634785993² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164634785999) 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, 6216818 + ... + 6243243.

It is an arithmetic number, because the mean of its divisors is an integer number (20976514377).

Almost surely, 2^164634785993 is an apocalyptic number.

It is an amenable number.

164634785993 is a deficient number, since it is larger than the sum of its proper divisors (3177329023).

164634785993 is a wasteful number, since it uses less digits than its factorization.

164634785993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12460315.

The product of its digits is 117573120, while the sum is 65.

The spelling of 164634785993 in words is "one hundred sixty-four billion, six hundred thirty-four million, seven hundred eighty-five thousand, nine hundred ninety-three".