191447647663 has 2 divisors, whose sum is σ = 191447647664. Its totient is φ = 191447647662.

The previous prime is 191447647621. The next prime is 191447647681. The reversal of 191447647663 is 366746744191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191447647663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191447647598 and 191447647607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191447617663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95723823831 + 95723823832.

It is an arithmetic number, because the mean of its divisors is an integer number (95723823832).

Almost surely, 2^191447647663 is an apocalyptic number.

191447647663 is a deficient number, since it is larger than the sum of its proper divisors (1).

191447647663 is an equidigital number, since it uses as much as digits as its factorization.

191447647663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 58.

The spelling of 191447647663 in words is "one hundred ninety-one billion, four hundred forty-seven million, six hundred forty-seven thousand, six hundred sixty-three".