165603640465604 has 24 divisors (see below), whose sum is σ = 316713954136608. Its totient is φ = 75140679741440.

The previous prime is 165603640465597. The next prime is 165603640465633. The reversal of 165603640465604 is 406564046306561.

165603640465604 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×165603640465604² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165603640465604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3342532157 + ... + 3342581700.

It is an arithmetic number, because the mean of its divisors is an integer number (13196414755692).

Almost surely, 2^{165603640465604} is an apocalyptic number.

It is an amenable number.

165603640465604 is a deficient number, since it is larger than the sum of its proper divisors (151110313671004).

165603640465604 is a wasteful number, since it uses less digits than its factorization.

165603640465604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6685114435 (or 6685114433 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 56.

The spelling of 165603640465604 in words is "one hundred sixty-five trillion, six hundred three billion, six hundred forty million, four hundred sixty-five thousand, six hundred four".