70794878821 has 2 divisors, whose sum is σ = 70794878822. Its totient is φ = 70794878820.

The previous prime is 70794878789. The next prime is 70794878849. The reversal of 70794878821 is 12887849707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60996650625 + 9798228196 = 246975^2 + 98986^2 .

It is a cyclic number.

It is not a de Polignac number, because 70794878821 - 2⁵ = 70794878789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70794878821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70794878881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35397439410 + 35397439411.

It is an arithmetic number, because the mean of its divisors is an integer number (35397439411).

Almost surely, 2^70794878821 is an apocalyptic number.

It is an amenable number.

70794878821 is a deficient number, since it is larger than the sum of its proper divisors (1).

70794878821 is an equidigital number, since it uses as much as digits as its factorization.

70794878821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12644352, while the sum is 61.

It can be divided in two parts, 707948 and 78821, that added together give a square (786769 = 887²).

The spelling of 70794878821 in words is "seventy billion, seven hundred ninety-four million, eight hundred seventy-eight thousand, eight hundred twenty-one".