7906378561 has 4 divisors (see below), whose sum is σ = 7907778900. Its totient is φ = 7904978224.

The previous prime is 7906378549. The next prime is 7906378577. The reversal of 7906378561 is 1658736097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1658736097 = 5717 ⋅290141.

It can be written as a sum of positive squares in 2 ways, for example, as 1332250000 + 6574128561 = 36500^2 + 81081^2 .

It is a cyclic number.

It is not a de Polignac number, because 7906378561 - 2¹⁹ = 7905854273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7906378499 and 7906378508.

It is not an unprimeable number, because it can be changed into a prime (7906378861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691666 + ... + 703003.

It is an arithmetic number, because the mean of its divisors is an integer number (1976944725).

Almost surely, 2^7906378561 is an apocalyptic number.

It is an amenable number.

7906378561 is a deficient number, since it is larger than the sum of its proper divisors (1400339).

7906378561 is a wasteful number, since it uses less digits than its factorization.

7906378561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400338.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 7906378561 is about 88917.8191421719. The cubic root of 7906378561 is about 1992.1675800567.

The spelling of 7906378561 in words is "seven billion, nine hundred six million, three hundred seventy-eight thousand, five hundred sixty-one".