165940404693 has 32 divisors (see below), whose sum is σ = 254353167360. Its totient is φ = 94264072320.

The previous prime is 165940404673. The next prime is 165940404727. The reversal of 165940404693 is 396404049561.

It is not a de Polignac number, because 165940404693 - 2²¹ = 165938307541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165940404673) 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, 19433521 + ... + 19442057.

It is an arithmetic number, because the mean of its divisors is an integer number (7948536480).

Almost surely, 2^165940404693 is an apocalyptic number.

It is an amenable number.

165940404693 is a deficient number, since it is larger than the sum of its proper divisors (88412762667).

165940404693 is a wasteful number, since it uses less digits than its factorization.

165940404693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13897.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 165940404693 in words is "one hundred sixty-five billion, nine hundred forty million, four hundred four thousand, six hundred ninety-three".