661148555 has 8 divisors (see below), whose sum is σ = 796671744. Its totient is φ = 526723200.

The previous prime is 661148539. The next prime is 661148557. The reversal of 661148555 is 555841166.

661148555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 661148555 - 2⁴ = 661148539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661148557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273131 + ... + 275540.

It is an arithmetic number, because the mean of its divisors is an integer number (99583968).

Almost surely, 2^661148555 is an apocalyptic number.

661148555 is a deficient number, since it is larger than the sum of its proper divisors (135523189).

661148555 is a wasteful number, since it uses less digits than its factorization.

661148555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548917.

The product of its digits is 144000, while the sum is 41.

The square root of 661148555 is about 25712.8091619722. The cubic root of 661148555 is about 871.1635266753.

The spelling of 661148555 in words is "six hundred sixty-one million, one hundred forty-eight thousand, five hundred fifty-five".