69491991493 has 2 divisors, whose sum is σ = 69491991494. Its totient is φ = 69491991492.

The previous prime is 69491991469. The next prime is 69491991533. The reversal of 69491991493 is 39419919496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61790524929 + 7701466564 = 248577^2 + 87758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69491991493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69491991463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34745995746 + 34745995747.

It is an arithmetic number, because the mean of its divisors is an integer number (34745995747).

Almost surely, 2^69491991493 is an apocalyptic number.

It is an amenable number.

69491991493 is a deficient number, since it is larger than the sum of its proper divisors (1).

69491991493 is an equidigital number, since it uses as much as digits as its factorization.

69491991493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17006112, while the sum is 64.

The spelling of 69491991493 in words is "sixty-nine billion, four hundred ninety-one million, nine hundred ninety-one thousand, four hundred ninety-three".