78631029073 has 2 divisors, whose sum is σ = 78631029074. Its totient is φ = 78631029072.

The previous prime is 78631029011. The next prime is 78631029089. The reversal of 78631029073 is 37092013687.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78345689409 + 285339664 = 279903^2 + 16892^2 .

It is a cyclic number.

It is not a de Polignac number, because 78631029073 - 2⁹ = 78631028561 is a prime.

It is not a weakly prime, because it can be changed into another prime (78631020073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39315514536 + 39315514537.

It is an arithmetic number, because the mean of its divisors is an integer number (39315514537).

Almost surely, 2^78631029073 is an apocalyptic number.

It is an amenable number.

78631029073 is a deficient number, since it is larger than the sum of its proper divisors (1).

78631029073 is an equidigital number, since it uses as much as digits as its factorization.

78631029073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 78631029073 in words is "seventy-eight billion, six hundred thirty-one million, twenty-nine thousand, seventy-three".