27043618643 has 2 divisors, whose sum is σ = 27043618644. Its totient is φ = 27043618642.

The previous prime is 27043618639. The next prime is 27043618729. The reversal of 27043618643 is 34681634072.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27043618643 - 2² = 27043618639 is a prime.

It is a super-2 number, since 2×27043618643² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27043618594 and 27043618603.

It is not a weakly prime, because it can be changed into another prime (27043618243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13521809321 + 13521809322.

It is an arithmetic number, because the mean of its divisors is an integer number (13521809322).

Almost surely, 2^27043618643 is an apocalyptic number.

27043618643 is a deficient number, since it is larger than the sum of its proper divisors (1).

27043618643 is an equidigital number, since it uses as much as digits as its factorization.

27043618643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 27043618643 in words is "twenty-seven billion, forty-three million, six hundred eighteen thousand, six hundred forty-three".