165940404694 has 4 divisors (see below), whose sum is σ = 248910607044. Its totient is φ = 82970202346.

The previous prime is 165940404673. The next prime is 165940404727. The reversal of 165940404694 is 496404049561.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41485101172 + ... + 41485101175.

It is an arithmetic number, because the mean of its divisors is an integer number (62227651761).

Almost surely, 2^165940404694 is an apocalyptic number.

165940404694 is a deficient number, since it is larger than the sum of its proper divisors (82970202350).

165940404694 is an equidigital number, since it uses as much as digits as its factorization.

165940404694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82970202349.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 165940404694 in words is "one hundred sixty-five billion, nine hundred forty million, four hundred four thousand, six hundred ninety-four".