3316918721 has 2 divisors, whose sum is σ = 3316918722. Its totient is φ = 3316918720.

The previous prime is 3316918691. The next prime is 3316918741. The reversal of 3316918721 is 1278196133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3084691600 + 232227121 = 55540^2 + 15239^2 .

It is a cyclic number.

It is not a de Polignac number, because 3316918721 - 2¹⁰ = 3316917697 is a prime.

It is a super-2 number, since 2×3316918721² = 22003899603440551682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3316918741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1658459360 + 1658459361.

It is an arithmetic number, because the mean of its divisors is an integer number (1658459361).

Almost surely, 2^3316918721 is an apocalyptic number.

It is an amenable number.

3316918721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3316918721 is an equidigital number, since it uses as much as digits as its factorization.

3316918721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 3316918721 is about 57592.6967679063. The cubic root of 3316918721 is about 1491.3455288593.

The spelling of 3316918721 in words is "three billion, three hundred sixteen million, nine hundred eighteen thousand, seven hundred twenty-one".