78508206451 has 2 divisors, whose sum is σ = 78508206452. Its totient is φ = 78508206450.

The previous prime is 78508206419. The next prime is 78508206479. The reversal of 78508206451 is 15460280587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78508206451 - 2⁵ = 78508206419 is a prime.

It is not a weakly prime, because it can be changed into another prime (78508206151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39254103225 + 39254103226.

It is an arithmetic number, because the mean of its divisors is an integer number (39254103226).

Almost surely, 2^78508206451 is an apocalyptic number.

78508206451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78508206451 is an equidigital number, since it uses as much as digits as its factorization.

78508206451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 78508206451 in words is "seventy-eight billion, five hundred eight million, two hundred six thousand, four hundred fifty-one".