78621030793 has 2 divisors, whose sum is σ = 78621030794. Its totient is φ = 78621030792.

The previous prime is 78621030781. The next prime is 78621030833. The reversal of 78621030793 is 39703012687.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60050972809 + 18570057984 = 245053^2 + 136272^2 .

It is a cyclic number.

It is not a de Polignac number, because 78621030793 - 2⁹ = 78621030281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78621030743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39310515396 + 39310515397.

It is an arithmetic number, because the mean of its divisors is an integer number (39310515397).

Almost surely, 2^78621030793 is an apocalyptic number.

It is an amenable number.

78621030793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78621030793 is an equidigital number, since it uses as much as digits as its factorization.

78621030793 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 78621030793 in words is "seventy-eight billion, six hundred twenty-one million, thirty thousand, seven hundred ninety-three".