15643988406947 has 2 divisors, whose sum is σ = 15643988406948. Its totient is φ = 15643988406946.

The previous prime is 15643988406901. The next prime is 15643988406989. The reversal of 15643988406947 is 74960488934651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15643988406947 - 2¹⁰ = 15643988405923 is a prime.

It is not a weakly prime, because it can be changed into another prime (15643988406997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821994203473 + 7821994203474.

It is an arithmetic number, because the mean of its divisors is an integer number (7821994203474).

Almost surely, 2^{15643988406947} is an apocalyptic number.

15643988406947 is a deficient number, since it is larger than the sum of its proper divisors (1).

15643988406947 is an equidigital number, since it uses as much as digits as its factorization.

15643988406947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1254113280, while the sum is 74.

The spelling of 15643988406947 in words is "fifteen trillion, six hundred forty-three billion, nine hundred eighty-eight million, four hundred six thousand, nine hundred forty-seven".