1020986665691 has 2 divisors, whose sum is σ = 1020986665692. Its totient is φ = 1020986665690.

The previous prime is 1020986665637. The next prime is 1020986665697. The reversal of 1020986665691 is 1965666890201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020986665691 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020986665691.

It is not a weakly prime, because it can be changed into another prime (1020986665697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510493332845 + 510493332846.

It is an arithmetic number, because the mean of its divisors is an integer number (510493332846).

Almost surely, 2^{1020986665691} is an apocalyptic number.

1020986665691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020986665691 is an equidigital number, since it uses as much as digits as its factorization.

1020986665691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 1020986665691 in words is "one trillion, twenty billion, nine hundred eighty-six million, six hundred sixty-five thousand, six hundred ninety-one".