165603216456 has 48 divisors (see below), whose sum is σ = 458939154960. Its totient is φ = 53917325280.

The previous prime is 165603216451. The next prime is 165603216461. The reversal of 165603216456 is 654612306561.

165603216456 is a `hidden beast` number, since 1 + 6 + 560 + 3 + 21 + 64 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (165603216451) and next prime (165603216461).

It is not an unprimeable number, because it can be changed into a prime (165603216451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26741610 + ... + 26747801.

It is an arithmetic number, because the mean of its divisors is an integer number (9561232395).

Almost surely, 2^165603216456 is an apocalyptic number.

It is an amenable number.

165603216456 is an abundant number, since it is smaller than the sum of its proper divisors (293335938504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165603216456 is a wasteful number, since it uses less digits than its factorization.

165603216456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53489466 (or 53489459 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 165603216456 in words is "one hundred sixty-five billion, six hundred three million, two hundred sixteen thousand, four hundred fifty-six".