661104555 has 8 divisors (see below), whose sum is σ = 1057767312. Its totient is φ = 352589088.

The previous prime is 661104553. The next prime is 661104581. The reversal of 661104555 is 555401166.

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

It is not a de Polignac number, because 661104555 - 2¹ = 661104553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661104553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22036804 + ... + 22036833.

It is an arithmetic number, because the mean of its divisors is an integer number (132220914).

Almost surely, 2^661104555 is an apocalyptic number.

661104555 is a deficient number, since it is larger than the sum of its proper divisors (396662757).

661104555 is a wasteful number, since it uses less digits than its factorization.

661104555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44073645.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 661104555 is about 25711.9535430507. The cubic root of 661104555 is about 871.1442006881.

The spelling of 661104555 in words is "six hundred sixty-one million, one hundred four thousand, five hundred fifty-five".