7978139460641 has 16 divisors (see below), whose sum is σ = 9140972225280. Its totient is φ = 6821084286720.

The previous prime is 7978139460619. The next prime is 7978139460659. The reversal of 7978139460641 is 1460649318797.

It is a cyclic number.

It is not a de Polignac number, because 7978139460641 - 2³⁴ = 7960959591457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7978139460661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34030181 + ... + 34263821.

It is an arithmetic number, because the mean of its divisors is an integer number (571310764080).

Almost surely, 2^{7978139460641} is an apocalyptic number.

It is an amenable number.

7978139460641 is a deficient number, since it is larger than the sum of its proper divisors (1162832764639).

7978139460641 is a wasteful number, since it uses less digits than its factorization.

7978139460641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245984.

The product of its (nonzero) digits is 54867456, while the sum is 65.

The spelling of 7978139460641 in words is "seven trillion, nine hundred seventy-eight billion, one hundred thirty-nine million, four hundred sixty thousand, six hundred forty-one".