550016661561 has 16 divisors (see below), whose sum is σ = 740182488384. Its totient is φ = 363278499264.

The previous prime is 550016661559. The next prime is 550016661569. The reversal of 550016661561 is 165166610055.

It is not a de Polignac number, because 550016661561 - 2¹ = 550016661559 is a prime.

It is a super-2 number, since 2×550016661561² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (550016661569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1619086 + ... + 1929111.

It is an arithmetic number, because the mean of its divisors is an integer number (46261405524).

Almost surely, 2^550016661561 is an apocalyptic number.

It is an amenable number.

550016661561 is a deficient number, since it is larger than the sum of its proper divisors (190165826823).

550016661561 is a wasteful number, since it uses less digits than its factorization.

550016661561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548680.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 550016661561 in words is "five hundred fifty billion, sixteen million, six hundred sixty-one thousand, five hundred sixty-one".