655465504721 has 4 divisors (see below), whose sum is σ = 689963689200. Its totient is φ = 620967320244.

The previous prime is 655465504717. The next prime is 655465504787. The reversal of 655465504721 is 127405564556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655465504721 - 2² = 655465504717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655465504721.

It is not an unprimeable number, because it can be changed into a prime (655465507721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17249092211 + ... + 17249092248.

It is an arithmetic number, because the mean of its divisors is an integer number (172490922300).

Almost surely, 2^655465504721 is an apocalyptic number.

It is an amenable number.

655465504721 is a deficient number, since it is larger than the sum of its proper divisors (34498184479).

655465504721 is a wasteful number, since it uses less digits than its factorization.

655465504721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34498184478.

The product of its (nonzero) digits is 5040000, while the sum is 50.

The spelling of 655465504721 in words is "six hundred fifty-five billion, four hundred sixty-five million, five hundred four thousand, seven hundred twenty-one".