655663760641 has 4 divisors (see below), whose sum is σ = 658083184384. Its totient is φ = 653244336900.

The previous prime is 655663760627. The next prime is 655663760669. The reversal of 655663760641 is 146067366556.

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 655663760641 - 2²³ = 655655372033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655663760671) 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, 1209711465 + ... + 1209712006.

It is an arithmetic number, because the mean of its divisors is an integer number (164520796096).

Almost surely, 2^655663760641 is an apocalyptic number.

It is an amenable number.

655663760641 is a deficient number, since it is larger than the sum of its proper divisors (2419423743).

655663760641 is a wasteful number, since it uses less digits than its factorization.

655663760641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419423742.

The product of its (nonzero) digits is 16329600, while the sum is 55.

The spelling of 655663760641 in words is "six hundred fifty-five billion, six hundred sixty-three million, seven hundred sixty thousand, six hundred forty-one".