996699643 has 2 divisors, whose sum is σ = 996699644. Its totient is φ = 996699642.

The previous prime is 996699619. The next prime is 996699653. The reversal of 996699643 is 346996699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 996699643 - 2⁵ = 996699611 is a prime.

It is not a weakly prime, because it can be changed into another prime (996699653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498349821 + 498349822.

It is an arithmetic number, because the mean of its divisors is an integer number (498349822).

Almost surely, 2^996699643 is an apocalyptic number.

996699643 is a deficient number, since it is larger than the sum of its proper divisors (1).

996699643 is an equidigital number, since it uses as much as digits as its factorization.

996699643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17006112, while the sum is 61.

The square root of 996699643 is about 31570.5502486099. The cubic root of 996699643 is about 998.8986685142.

The spelling of 996699643 in words is "nine hundred ninety-six million, six hundred ninety-nine thousand, six hundred forty-three".