70281238681 has 4 divisors (see below), whose sum is σ = 72704729700. Its totient is φ = 67857747664.

The previous prime is 70281238679. The next prime is 70281238691. The reversal of 70281238681 is 18683218207.

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 28591766281 + 41689472400 = 169091^2 + 204180^2 .

It is a cyclic number.

It is not a de Polignac number, because 70281238681 - 2¹ = 70281238679 is a prime.

It is a super-2 number, since 2×70281238681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70281238631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1211745466 + ... + 1211745523.

It is an arithmetic number, because the mean of its divisors is an integer number (18176182425).

Almost surely, 2^70281238681 is an apocalyptic number.

It is an amenable number.

70281238681 is a deficient number, since it is larger than the sum of its proper divisors (2423491019).

70281238681 is a wasteful number, since it uses less digits than its factorization.

70281238681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423491018.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 70281238681 in words is "seventy billion, two hundred eighty-one million, two hundred thirty-eight thousand, six hundred eighty-one".