78242237611 has 2 divisors, whose sum is σ = 78242237612. Its totient is φ = 78242237610.

The previous prime is 78242237543. The next prime is 78242237621. The reversal of 78242237611 is 11673224287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78242237611 - 2⁷ = 78242237483 is a prime.

It is a super-2 number, since 2×78242237611² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78242237621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39121118805 + 39121118806.

It is an arithmetic number, because the mean of its divisors is an integer number (39121118806).

Almost surely, 2^78242237611 is an apocalyptic number.

78242237611 is a deficient number, since it is larger than the sum of its proper divisors (1).

78242237611 is an equidigital number, since it uses as much as digits as its factorization.

78242237611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The spelling of 78242237611 in words is "seventy-eight billion, two hundred forty-two million, two hundred thirty-seven thousand, six hundred eleven".