16556661530 has 16 divisors (see below), whose sum is σ = 29804488704. Its totient is φ = 6622109520.

The previous prime is 16556661521. The next prime is 16556661587. The reversal of 16556661530 is 3516665561.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69035 + ... + 194625.

It is an arithmetic number, because the mean of its divisors is an integer number (1862780544).

Almost surely, 2^16556661530 is an apocalyptic number.

16556661530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16556661530 is a deficient number, since it is larger than the sum of its proper divisors (13247827174).

16556661530 is a wasteful number, since it uses less digits than its factorization.

16556661530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138781.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 16556661530 in words is "sixteen billion, five hundred fifty-six million, six hundred sixty-one thousand, five hundred thirty".