997437643511 has 2 divisors, whose sum is σ = 997437643512. Its totient is φ = 997437643510.

The previous prime is 997437643457. The next prime is 997437643549. The reversal of 997437643511 is 115346734799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997437643511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997437643211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498718821755 + 498718821756.

It is an arithmetic number, because the mean of its divisors is an integer number (498718821756).

Almost surely, 2^997437643511 is an apocalyptic number.

997437643511 is a deficient number, since it is larger than the sum of its proper divisors (1).

997437643511 is an equidigital number, since it uses as much as digits as its factorization.

997437643511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 59.

The spelling of 997437643511 in words is "nine hundred ninety-seven billion, four hundred thirty-seven million, six hundred forty-three thousand, five hundred eleven".