16661660550 has 48 divisors (see below), whose sum is σ = 42437713872. Its totient is φ = 4323024000.

The previous prime is 16661660537. The next prime is 16661660563. The reversal of 16661660550 is 5506616661.

It is an interprime number because it is at equal distance from previous prime (16661660537) and next prime (16661660563).

It is a super-2 number, since 2×16661660550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1495501 + ... + 1506600.

It is an arithmetic number, because the mean of its divisors is an integer number (884119039).

Almost surely, 2^16661660550 is an apocalyptic number.

16661660550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16661660550 is an abundant number, since it is smaller than the sum of its proper divisors (25776053322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16661660550 is a wasteful number, since it uses less digits than its factorization.

16661660550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002153 (or 3002148 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 16661660550 in words is "sixteen billion, six hundred sixty-one million, six hundred sixty thousand, five hundred fifty".