78218582340947 has 2 divisors, whose sum is σ = 78218582340948. Its totient is φ = 78218582340946.

The previous prime is 78218582340937. The next prime is 78218582341057. The reversal of 78218582340947 is 74904328581287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78218582340947 - 2²⁸ = 78218313905491 is a prime.

It is a super-2 number, since 2×78218582340947² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78218582340917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39109291170473 + 39109291170474.

It is an arithmetic number, because the mean of its divisors is an integer number (39109291170474).

Almost surely, 2^{78218582340947} is an apocalyptic number.

78218582340947 is a deficient number, since it is larger than the sum of its proper divisors (1).

78218582340947 is an equidigital number, since it uses as much as digits as its factorization.

78218582340947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216760320, while the sum is 68.

The spelling of 78218582340947 in words is "seventy-eight trillion, two hundred eighteen billion, five hundred eighty-two million, three hundred forty thousand, nine hundred forty-seven".