1863623640691 has 2 divisors, whose sum is σ = 1863623640692. Its totient is φ = 1863623640690.

The previous prime is 1863623640551. The next prime is 1863623640707. The reversal of 1863623640691 is 1960463263681.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1863623640691 - 2¹⁹ = 1863623116403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1863623640191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 931811820345 + 931811820346.

It is an arithmetic number, because the mean of its divisors is an integer number (931811820346).

Almost surely, 2^{1863623640691} is an apocalyptic number.

1863623640691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1863623640691 is an equidigital number, since it uses as much as digits as its factorization.

1863623640691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 55.

The spelling of 1863623640691 in words is "one trillion, eight hundred sixty-three billion, six hundred twenty-three million, six hundred forty thousand, six hundred ninety-one".