70278342821 has 4 divisors (see below), whose sum is σ = 70569954444. Its totient is φ = 69986731200.

The previous prime is 70278342817. The next prime is 70278342863. The reversal of 70278342821 is 12824387207.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19513296100 + 50765046721 = 139690^2 + 225311^2 .

It is a cyclic number.

It is not a de Polignac number, because 70278342821 - 2² = 70278342817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70278342521) 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 3 ways as a sum of consecutive naturals, for example, 145805450 + ... + 145805931.

It is an arithmetic number, because the mean of its divisors is an integer number (17642488611).

Almost surely, 2^70278342821 is an apocalyptic number.

It is an amenable number.

70278342821 is a deficient number, since it is larger than the sum of its proper divisors (291611623).

70278342821 is a wasteful number, since it uses less digits than its factorization.

70278342821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291611622.

The product of its (nonzero) digits is 301056, while the sum is 44.

The spelling of 70278342821 in words is "seventy billion, two hundred seventy-eight million, three hundred forty-two thousand, eight hundred twenty-one".