1616680221 has 8 divisors (see below), whose sum is σ = 2321387040. Its totient is φ = 994880112.

The previous prime is 1616680211. The next prime is 1616680243. The reversal of 1616680221 is 1220866161.

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

It is not a de Polignac number, because 1616680221 - 2²⁶ = 1549571357 is a prime.

It is a super-2 number, since 2×1616680221² = 5227309873945217682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616680211) 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, 20726631 + ... + 20726708.

It is an arithmetic number, because the mean of its divisors is an integer number (290173380).

Almost surely, 2^1616680221 is an apocalyptic number.

It is an amenable number.

1616680221 is a deficient number, since it is larger than the sum of its proper divisors (704706819).

1616680221 is a wasteful number, since it uses less digits than its factorization.

1616680221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41453355.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1616680221 is about 40207.9621592540. The cubic root of 1616680221 is about 1173.6574909200.

The spelling of 1616680221 in words is "one billion, six hundred sixteen million, six hundred eighty thousand, two hundred twenty-one".