1863913863893 has 2 divisors, whose sum is σ = 1863913863894. Its totient is φ = 1863913863892.

The previous prime is 1863913863871. The next prime is 1863913863907. The reversal of 1863913863893 is 3983683193681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1787052955249 + 76860908644 = 1336807^2 + 277238^2 .

It is a cyclic number.

It is not a de Polignac number, because 1863913863893 - 2⁶ = 1863913863829 is a prime.

It is a super-3 number, since 3×1863913863893³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1863913863803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 931956931946 + 931956931947.

It is an arithmetic number, because the mean of its divisors is an integer number (931956931947).

Almost surely, 2^{1863913863893} is an apocalyptic number.

It is an amenable number.

1863913863893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1863913863893 is an equidigital number, since it uses as much as digits as its factorization.

1863913863893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120932352, while the sum is 68.

The spelling of 1863913863893 in words is "one trillion, eight hundred sixty-three billion, nine hundred thirteen million, eight hundred sixty-three thousand, eight hundred ninety-three".