655501661559 has 32 divisors (see below), whose sum is σ = 1037006745600. Its totient is φ = 408321375840.

The previous prime is 655501661537. The next prime is 655501661567. The reversal of 655501661559 is 955166105556.

655501661559 is a `hidden beast` number, since 6 + 5 + 5 + 5 + 0 + 16 + 615 + 5 + 9 = 666.

It is not a de Polignac number, because 655501661559 - 2¹¹ = 655501659511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655501661459) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 13478419 + ... + 13526964.

It is an arithmetic number, because the mean of its divisors is an integer number (32406460800).

Almost surely, 2^655501661559 is an apocalyptic number.

655501661559 is a deficient number, since it is larger than the sum of its proper divisors (381505084041).

655501661559 is a wasteful number, since it uses less digits than its factorization.

655501661559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27005452 (or 27005446 counting only the distinct ones).

The product of its (nonzero) digits is 6075000, while the sum is 54.

The spelling of 655501661559 in words is "six hundred fifty-five billion, five hundred one million, six hundred sixty-one thousand, five hundred fifty-nine".