165865785701 has 32 divisors (see below), whose sum is σ = 215864636160. Its totient is φ = 123691276800.

The previous prime is 165865785671. The next prime is 165865785707. The reversal of 165865785701 is 107587568561.

It is not a de Polignac number, because 165865785701 - 2¹⁰ = 165865784677 is a prime.

It is a super-2 number, since 2×165865785701² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165865785707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303416 + ... + 650993.

It is an arithmetic number, because the mean of its divisors is an integer number (6745769880).

Almost surely, 2^165865785701 is an apocalyptic number.

165865785701 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165865785701 is a deficient number, since it is larger than the sum of its proper divisors (49998850459).

165865785701 is a wasteful number, since it uses less digits than its factorization.

165865785701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954525.

The product of its (nonzero) digits is 14112000, while the sum is 59.

The spelling of 165865785701 in words is "one hundred sixty-five billion, eight hundred sixty-five million, seven hundred eighty-five thousand, seven hundred one".