70681909091 has 4 divisors (see below), whose sum is σ = 70688511432. Its totient is φ = 70675306752.

The previous prime is 70681909049. The next prime is 70681909093. The reversal of 70681909091 is 19090918607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19090918607 = 86861 ⋅219787.

It is a cyclic number.

It is not a de Polignac number, because 70681909091 - 2⁶ = 70681909027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70681909093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3285086 + ... + 3306531.

It is an arithmetic number, because the mean of its divisors is an integer number (17672127858).

Almost surely, 2^70681909091 is an apocalyptic number.

70681909091 is a deficient number, since it is larger than the sum of its proper divisors (6602341).

70681909091 is a wasteful number, since it uses less digits than its factorization.

70681909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6602340.

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 70681909091 in words is "seventy billion, six hundred eighty-one million, nine hundred nine thousand, ninety-one".