655221177655 has 48 divisors (see below), whose sum is σ = 916219920672. Its totient is φ = 447934924800.

The previous prime is 655221177643. The next prime is 655221177703. The reversal of 655221177655 is 556771122556.

It is a happy number.

It is not a de Polignac number, because 655221177655 - 2¹¹ = 655221175607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8301859 + ... + 8380411.

It is an arithmetic number, because the mean of its divisors is an integer number (19087915014).

Almost surely, 2^655221177655 is an apocalyptic number.

655221177655 is a deficient number, since it is larger than the sum of its proper divisors (260998743017).

655221177655 is a wasteful number, since it uses less digits than its factorization.

655221177655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79408 (or 79397 counting only the distinct ones).

The product of its digits is 4410000, while the sum is 52.

The spelling of 655221177655 in words is "six hundred fifty-five billion, two hundred twenty-one million, one hundred seventy-seven thousand, six hundred fifty-five".