1616722993 has 2 divisors, whose sum is σ = 1616722994. Its totient is φ = 1616722992.

The previous prime is 1616722981. The next prime is 1616723011. The reversal of 1616722993 is 3992276161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1409852304 + 206870689 = 37548^2 + 14383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1616722993 is a prime.

It is a super-2 number, since 2×1616722993² = 5227586472189756098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616722903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808361496 + 808361497.

It is an arithmetic number, because the mean of its divisors is an integer number (808361497).

Almost surely, 2^1616722993 is an apocalyptic number.

It is an amenable number.

1616722993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616722993 is an equidigital number, since it uses as much as digits as its factorization.

1616722993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 1616722993 is about 40208.4940404388. The cubic root of 1616722993 is about 1173.6678411910.

The spelling of 1616722993 in words is "one billion, six hundred sixteen million, seven hundred twenty-two thousand, nine hundred ninety-three".