17940991963 has 2 divisors, whose sum is σ = 17940991964. Its totient is φ = 17940991962.

The previous prime is 17940991903. The next prime is 17940991969. The reversal of 17940991963 is 36919904971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17940991963 - 2¹³ = 17940983771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17940991898 and 17940991907.

It is not a weakly prime, because it can be changed into another prime (17940991969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8970495981 + 8970495982.

It is an arithmetic number, because the mean of its divisors is an integer number (8970495982).

Almost surely, 2^17940991963 is an apocalyptic number.

17940991963 is a deficient number, since it is larger than the sum of its proper divisors (1).

17940991963 is an equidigital number, since it uses as much as digits as its factorization.

17940991963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 58.

The spelling of 17940991963 in words is "seventeen billion, nine hundred forty million, nine hundred ninety-one thousand, nine hundred sixty-three".