16661557004 has 6 divisors (see below), whose sum is σ = 29157724764. Its totient is φ = 8330778500.

The previous prime is 16661557001. The next prime is 16661557009. The reversal of 16661557004 is 40075516661.

16661557004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082694622 + ... + 2082694629.

It is an arithmetic number, because the mean of its divisors is an integer number (4859620794).

Almost surely, 2^16661557004 is an apocalyptic number.

It is an amenable number.

16661557004 is a deficient number, since it is larger than the sum of its proper divisors (12496167760).

16661557004 is a wasteful number, since it uses less digits than its factorization.

16661557004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4165389255 (or 4165389253 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 16661557004 in words is "sixteen billion, six hundred sixty-one million, five hundred fifty-seven thousand, four".