11643397639 has 2 divisors, whose sum is σ = 11643397640. Its totient is φ = 11643397638.

The previous prime is 11643397567. The next prime is 11643397673. The reversal of 11643397639 is 93679334611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11643397639 - 2⁹ = 11643397127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11643397439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821698819 + 5821698820.

It is an arithmetic number, because the mean of its divisors is an integer number (5821698820).

Almost surely, 2^11643397639 is an apocalyptic number.

11643397639 is a deficient number, since it is larger than the sum of its proper divisors (1).

11643397639 is an equidigital number, since it uses as much as digits as its factorization.

11643397639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 52.

The spelling of 11643397639 in words is "eleven billion, six hundred forty-three million, three hundred ninety-seven thousand, six hundred thirty-nine".