165837970389 has 64 divisors (see below), whose sum is σ = 286647388160. Its totient is φ = 82819065600.

The previous prime is 165837970369. The next prime is 165837970421. The reversal of 165837970389 is 983079738561.

It is not a de Polignac number, because 165837970389 - 2⁷ = 165837970261 is a prime.

It is a super-2 number, since 2×165837970389² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165837970369) 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, 9052539 + ... + 9070839.

It is an arithmetic number, because the mean of its divisors is an integer number (4478865440).

Almost surely, 2^165837970389 is an apocalyptic number.

165837970389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

165837970389 is a deficient number, since it is larger than the sum of its proper divisors (120809417771).

165837970389 is a wasteful number, since it uses less digits than its factorization.

165837970389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20090.

The product of its (nonzero) digits is 68584320, while the sum is 66.

The spelling of 165837970389 in words is "one hundred sixty-five billion, eight hundred thirty-seven million, nine hundred seventy thousand, three hundred eighty-nine".