1616680243 has 2 divisors, whose sum is σ = 1616680244. Its totient is φ = 1616680242.

The previous prime is 1616680211. The next prime is 1616680249. The reversal of 1616680243 is 3420866161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1616680243 - 2⁵ = 1616680211 is a prime.

It is a super-3 number, since 3×1616680243³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1616680249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808340121 + 808340122.

It is an arithmetic number, because the mean of its divisors is an integer number (808340122).

Almost surely, 2^1616680243 is an apocalyptic number.

1616680243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616680243 is an equidigital number, since it uses as much as digits as its factorization.

1616680243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1616680243 is about 40207.9624328316. The cubic root of 1616680243 is about 1173.6574962437.

The spelling of 1616680243 in words is "one billion, six hundred sixteen million, six hundred eighty thousand, two hundred forty-three".