16616155051666 has 4 divisors (see below), whose sum is σ = 24924232577502. Its totient is φ = 8308077525832.

The previous prime is 16616155051651. The next prime is 16616155051669. The reversal of 16616155051666 is 66615055161661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16139542934025 + 476612117641 = 4017405^2 + 690371^2 .

It is a super-2 number, since 2×16616155051666² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16616155051669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4154038762915 + ... + 4154038762918.

Almost surely, 2^{16616155051666} is an apocalyptic number.

16616155051666 is a deficient number, since it is larger than the sum of its proper divisors (8308077525836).

16616155051666 is an equidigital number, since it uses as much as digits as its factorization.

16616155051666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8308077525835.

The product of its (nonzero) digits is 5832000, while the sum is 55.

It can be divided in two parts, 1661615 and 5051666, that added together give a square (6713281 = 2591²).

The spelling of 16616155051666 in words is "sixteen trillion, six hundred sixteen billion, one hundred fifty-five million, fifty-one thousand, six hundred sixty-six".