7578821949451 has 2 divisors, whose sum is σ = 7578821949452. Its totient is φ = 7578821949450.

The previous prime is 7578821949443. The next prime is 7578821949541. The reversal of 7578821949451 is 1549491288757.

Together with next prime (7578821949541) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7578821949451 - 2³ = 7578821949443 is a prime.

It is not a weakly prime, because it can be changed into another prime (7578821949551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3789410974725 + 3789410974726.

It is an arithmetic number, because the mean of its divisors is an integer number (3789410974726).

Almost surely, 2^{7578821949451} is an apocalyptic number.

7578821949451 is a deficient number, since it is larger than the sum of its proper divisors (1).

7578821949451 is an equidigital number, since it uses as much as digits as its factorization.

7578821949451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 203212800, while the sum is 70.

The spelling of 7578821949451 in words is "seven trillion, five hundred seventy-eight billion, eight hundred twenty-one million, nine hundred forty-nine thousand, four hundred fifty-one".