655421081738557 has 8 divisors (see below), whose sum is σ = 658391543425280. Its totient is φ = 652450899996000.

The previous prime is 655421081738519. The next prime is 655421081738561. The reversal of 655421081738557 is 755837180124556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655421081738557 - 2⁴⁷ = 514683593383229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655421081738492 and 655421081738501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655421081748557) 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 7 ways as a sum of consecutive naturals, for example, 65292207 + ... + 74658652.

It is an arithmetic number, because the mean of its divisors is an integer number (82298942928160).

Almost surely, 2^{655421081738557} is an apocalyptic number.

It is an amenable number.

655421081738557 is a deficient number, since it is larger than the sum of its proper divisors (2970461686723).

655421081738557 is a wasteful number, since it uses less digits than its factorization.

655421081738557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139972083.

The product of its (nonzero) digits is 282240000, while the sum is 67.

The spelling of 655421081738557 in words is "six hundred fifty-five trillion, four hundred twenty-one billion, eighty-one million, seven hundred thirty-eight thousand, five hundred fifty-seven".