16656573550 has 48 divisors (see below), whose sum is σ = 32369356800. Its totient is φ = 6364844640.

The previous prime is 16656573529. The next prime is 16656573551. The reversal of 16656573550 is 5537565661.

It is a junction number, because it is equal to n+sod(n) for n = 16656573494 and 16656573503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656573551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 937651 + ... + 955249.

It is an arithmetic number, because the mean of its divisors is an integer number (674361600).

Almost surely, 2^16656573550 is an apocalyptic number.

16656573550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16656573550 is a deficient number, since it is larger than the sum of its proper divisors (15712783250).

16656573550 is a wasteful number, since it uses less digits than its factorization.

16656573550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18457 (or 18452 counting only the distinct ones).

The product of its (nonzero) digits is 2835000, while the sum is 49.

The spelling of 16656573550 in words is "sixteen billion, six hundred fifty-six million, five hundred seventy-three thousand, five hundred fifty".