16661557003 has 8 divisors (see below), whose sum is σ = 20506531808. Its totient is φ = 13182770304.

The previous prime is 16661557001. The next prime is 16661557009. The reversal of 16661557003 is 30075516661.

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

It is a cyclic number.

It is not a de Polignac number, because 16661557003 - 2¹ = 16661557001 is a prime.

It is a super-3 number, since 3×16661557003³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16661557001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91546926 + ... + 91547107.

It is an arithmetic number, because the mean of its divisors is an integer number (2563316476).

Almost surely, 2^16661557003 is an apocalyptic number.

16661557003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16661557003 is a deficient number, since it is larger than the sum of its proper divisors (3844974805).

16661557003 is a wasteful number, since it uses less digits than its factorization.

16661557003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183094053.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 16661557003 in words is "sixteen billion, six hundred sixty-one million, five hundred fifty-seven thousand, three".