70124531681 has 4 divisors (see below), whose sum is σ = 72019789332. Its totient is φ = 68229274032.

The previous prime is 70124531669. The next prime is 70124531693. The reversal of 70124531681 is 18613542107.

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

It is an interprime number because it is at equal distance from previous prime (70124531669) and next prime (70124531693).

It can be written as a sum of positive squares in 2 ways, for example, as 28761107281 + 41363424400 = 169591^2 + 203380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70124531681 is a prime.

It is a super-2 number, since 2×70124531681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70124731681) 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, 947628770 + ... + 947628843.

It is an arithmetic number, because the mean of its divisors is an integer number (18004947333).

Almost surely, 2^70124531681 is an apocalyptic number.

It is an amenable number.

70124531681 is a deficient number, since it is larger than the sum of its proper divisors (1895257651).

70124531681 is a wasteful number, since it uses less digits than its factorization.

70124531681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895257650.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 70124531681 in words is "seventy billion, one hundred twenty-four million, five hundred thirty-one thousand, six hundred eighty-one".