78275908391 has 2 divisors, whose sum is σ = 78275908392. Its totient is φ = 78275908390.

The previous prime is 78275908307. The next prime is 78275908433. The reversal of 78275908391 is 19380957287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78275908391 - 2¹⁴ = 78275892007 is a prime.

It is a super-2 number, since 2×78275908391² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78275908391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78275908691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39137954195 + 39137954196.

It is an arithmetic number, because the mean of its divisors is an integer number (39137954196).

Almost surely, 2^78275908391 is an apocalyptic number.

78275908391 is a deficient number, since it is larger than the sum of its proper divisors (1).

78275908391 is an equidigital number, since it uses as much as digits as its factorization.

78275908391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 78275908391 in words is "seventy-eight billion, two hundred seventy-five million, nine hundred eight thousand, three hundred ninety-one".