661617550033 has 8 divisors (see below), whose sum is σ = 746653034880. Its totient is φ = 580730137680.

The previous prime is 661617549979. The next prime is 661617550049. The reversal of 661617550033 is 330055716166.

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

It is a de Polignac number, because none of the positive numbers 2^k-661617550033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661617550333) 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, 1037017785 + ... + 1037018422.

It is an arithmetic number, because the mean of its divisors is an integer number (93331629360).

Almost surely, 2^661617550033 is an apocalyptic number.

It is an amenable number.

661617550033 is a deficient number, since it is larger than the sum of its proper divisors (85035484847).

661617550033 is a wasteful number, since it uses less digits than its factorization.

661617550033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074036247.

The product of its (nonzero) digits is 340200, while the sum is 43.

The spelling of 661617550033 in words is "six hundred sixty-one billion, six hundred seventeen million, five hundred fifty thousand, thirty-three".