2643731655847 has 2 divisors, whose sum is σ = 2643731655848. Its totient is φ = 2643731655846.

The previous prime is 2643731655841. The next prime is 2643731655883. The reversal of 2643731655847 is 7485561373462.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643731655847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643731655841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321865827923 + 1321865827924.

It is an arithmetic number, because the mean of its divisors is an integer number (1321865827924).

Almost surely, 2^{2643731655847} is an apocalyptic number.

2643731655847 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643731655847 is an equidigital number, since it uses as much as digits as its factorization.

2643731655847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 101606400, while the sum is 61.

The spelling of 2643731655847 in words is "two trillion, six hundred forty-three billion, seven hundred thirty-one million, six hundred fifty-five thousand, eight hundred forty-seven".