1863623640551 has 2 divisors, whose sum is σ = 1863623640552. Its totient is φ = 1863623640550.

The previous prime is 1863623640521. The next prime is 1863623640691. The reversal of 1863623640551 is 1550463263681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1863623640551 - 2¹⁴ = 1863623624167 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 1863623640551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1863623640521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 931811820275 + 931811820276.

It is an arithmetic number, because the mean of its divisors is an integer number (931811820276).

Almost surely, 2^{1863623640551} is an apocalyptic number.

1863623640551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1863623640551 is an equidigital number, since it uses as much as digits as its factorization.

1863623640551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 1863623640551 in words is "one trillion, eight hundred sixty-three billion, six hundred twenty-three million, six hundred forty thousand, five hundred fifty-one".