11897481643 has 2 divisors, whose sum is σ = 11897481644. Its totient is φ = 11897481642.

The previous prime is 11897481611. The next prime is 11897481667. The reversal of 11897481643 is 34618479811.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34618479811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11897481643 - 2⁵ = 11897481611 is a prime.

It is not a weakly prime, because it can be changed into another prime (11897401643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5948740821 + 5948740822.

It is an arithmetic number, because the mean of its divisors is an integer number (5948740822).

Almost surely, 2^11897481643 is an apocalyptic number.

11897481643 is a deficient number, since it is larger than the sum of its proper divisors (1).

11897481643 is an equidigital number, since it uses as much as digits as its factorization.

11897481643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The spelling of 11897481643 in words is "eleven billion, eight hundred ninety-seven million, four hundred eighty-one thousand, six hundred forty-three".