71663258438906 has 16 divisors (see below), whose sum is σ = 107592885953448. Its totient is φ = 35798971507200.

The previous prime is 71663258438843. The next prime is 71663258438921. The reversal of 71663258438906 is 60983485236617.

It can be written as a sum of positive squares in 4 ways, for example, as 62417347216225 + 9245911222681 = 7900465^2 + 3040709^2 .

It is a super-2 number, since 2×71663258438906² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15030176 + ... + 19215428.

It is a 1-persistent number, because it is pandigital, but 2⋅71663258438906 = 143326516877812 is not.

Almost surely, 2^{71663258438906} is an apocalyptic number.

71663258438906 is a deficient number, since it is larger than the sum of its proper divisors (35929627514542).

71663258438906 is a wasteful number, since it uses less digits than its factorization.

71663258438906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193057.

The product of its (nonzero) digits is 313528320, while the sum is 68.

The spelling of 71663258438906 in words is "seventy-one trillion, six hundred sixty-three billion, two hundred fifty-eight million, four hundred thirty-eight thousand, nine hundred six".