78336243641 has 2 divisors, whose sum is σ = 78336243642. Its totient is φ = 78336243640.

The previous prime is 78336243599. The next prime is 78336243701. The reversal of 78336243641 is 14634263387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70913559616 + 7422684025 = 266296^2 + 86155^2 .

It is an emirp because it is prime and its reverse (14634263387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78336243641 - 2⁶ = 78336243577 is a prime.

It is a super-2 number, since 2×78336243641² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78336245641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39168121820 + 39168121821.

It is an arithmetic number, because the mean of its divisors is an integer number (39168121821).

Almost surely, 2^78336243641 is an apocalyptic number.

It is an amenable number.

78336243641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78336243641 is an equidigital number, since it uses as much as digits as its factorization.

78336243641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 47.

The spelling of 78336243641 in words is "seventy-eight billion, three hundred thirty-six million, two hundred forty-three thousand, six hundred forty-one".