78530831021807 has 2 divisors, whose sum is σ = 78530831021808. Its totient is φ = 78530831021806.

The previous prime is 78530831021767. The next prime is 78530831021809. The reversal of 78530831021807 is 70812013803587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78530831021807 - 2¹⁶ = 78530830956271 is a prime.

Together with 78530831021809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78530831021809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39265415510903 + 39265415510904.

It is an arithmetic number, because the mean of its divisors is an integer number (39265415510904).

Almost surely, 2^{78530831021807} is an apocalyptic number.

78530831021807 is a deficient number, since it is larger than the sum of its proper divisors (1).

78530831021807 is an equidigital number, since it uses as much as digits as its factorization.

78530831021807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 78530831021807 in words is "seventy-eight trillion, five hundred thirty billion, eight hundred thirty-one million, twenty-one thousand, eight hundred seven".