1676643691 has 2 divisors, whose sum is σ = 1676643692. Its totient is φ = 1676643690.

The previous prime is 1676643679. The next prime is 1676643697. The reversal of 1676643691 is 1963466761.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1963466761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1676643691 is a prime.

It is a super-2 number, since 2×1676643691² = 5622268133140206962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1676643697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 838321845 + 838321846.

It is an arithmetic number, because the mean of its divisors is an integer number (838321846).

Almost surely, 2^1676643691 is an apocalyptic number.

1676643691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1676643691 is an equidigital number, since it uses as much as digits as its factorization.

1676643691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 49.

The square root of 1676643691 is about 40946.8398170115. The cubic root of 1676643691 is about 1187.9922104471.

The spelling of 1676643691 in words is "one billion, six hundred seventy-six million, six hundred forty-three thousand, six hundred ninety-one".