551661605606 has 8 divisors (see below), whose sum is σ = 829877113800. Its totient is φ = 275035901008.

The previous prime is 551661605591. The next prime is 551661605609. The reversal of 551661605606 is 606506166155.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551661605609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397450031 + ... + 397451418.

It is an arithmetic number, because the mean of its divisors is an integer number (103734639225).

Almost surely, 2^551661605606 is an apocalyptic number.

551661605606 is a deficient number, since it is larger than the sum of its proper divisors (278215508194).

551661605606 is a wasteful number, since it uses less digits than its factorization.

551661605606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794901798.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 551661605606 in words is "five hundred fifty-one billion, six hundred sixty-one million, six hundred five thousand, six hundred six".