78621527507 has 2 divisors, whose sum is σ = 78621527508. Its totient is φ = 78621527506.

The previous prime is 78621527497. The next prime is 78621527519. The reversal of 78621527507 is 70572512687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78621527507 - 2²⁰ = 78620478931 is a prime.

It is not a weakly prime, because it can be changed into another prime (78621527707) 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, 39310763753 + 39310763754.

It is an arithmetic number, because the mean of its divisors is an integer number (39310763754).

Almost surely, 2^78621527507 is an apocalyptic number.

78621527507 is a deficient number, since it is larger than the sum of its proper divisors (1).

78621527507 is an equidigital number, since it uses as much as digits as its factorization.

78621527507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1646400, while the sum is 50.

The spelling of 78621527507 in words is "seventy-eight billion, six hundred twenty-one million, five hundred twenty-seven thousand, five hundred seven".