91865018603 has 2 divisors, whose sum is σ = 91865018604. Its totient is φ = 91865018602.

The previous prime is 91865018593. The next prime is 91865018621. The reversal of 91865018603 is 30681056819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91865018603 - 2⁴ = 91865018587 is a prime.

It is not a weakly prime, because it can be changed into another prime (91865018633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932509301 + 45932509302.

It is an arithmetic number, because the mean of its divisors is an integer number (45932509302).

Almost surely, 2^91865018603 is an apocalyptic number.

91865018603 is a deficient number, since it is larger than the sum of its proper divisors (1).

91865018603 is an equidigital number, since it uses as much as digits as its factorization.

91865018603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 91865018603 in words is "ninety-one billion, eight hundred sixty-five million, eighteen thousand, six hundred three".