70840837409 has 4 divisors (see below), whose sum is σ = 71009909040. Its totient is φ = 70671765780.

The previous prime is 70840837387. The next prime is 70840837421. The reversal of 70840837409 is 90473804807.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90473804807 = 257 ⋅352038151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70840837409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70840837709) 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, 84535187 + ... + 84536024.

It is an arithmetic number, because the mean of its divisors is an integer number (17752477260).

Almost surely, 2^70840837409 is an apocalyptic number.

It is an amenable number.

70840837409 is a deficient number, since it is larger than the sum of its proper divisors (169071631).

70840837409 is a wasteful number, since it uses less digits than its factorization.

70840837409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169071630.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 70840837409 in words is "seventy billion, eight hundred forty million, eight hundred thirty-seven thousand, four hundred nine".