71825435681 has 4 divisors (see below), whose sum is σ = 72522770112. Its totient is φ = 71128101252.

The previous prime is 71825435677. The next prime is 71825435683. The reversal of 71825435681 is 18653452817.

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.

It is a cyclic number.

It is not a de Polignac number, because 71825435681 - 2² = 71825435677 is a prime.

It is a super-2 number, since 2×71825435681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71825435683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348667061 + ... + 348667266.

It is an arithmetic number, because the mean of its divisors is an integer number (18130692528).

Almost surely, 2^71825435681 is an apocalyptic number.

It is an amenable number.

71825435681 is a deficient number, since it is larger than the sum of its proper divisors (697334431).

71825435681 is a wasteful number, since it uses less digits than its factorization.

71825435681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697334430.

The product of its digits is 1612800, while the sum is 50.

The spelling of 71825435681 in words is "seventy-one billion, eight hundred twenty-five million, four hundred thirty-five thousand, six hundred eighty-one".