71649381506 has 16 divisors (see below), whose sum is σ = 107983166904. Its totient is φ = 35655345024.

The previous prime is 71649381487. The next prime is 71649381511. The reversal of 71649381506 is 60518394617.

It can be written as a sum of positive squares in 4 ways, for example, as 22527308281 + 49122073225 = 150091^2 + 221635^2 .

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, 321140 + ... + 496416.

Almost surely, 2^71649381506 is an apocalyptic number.

71649381506 is a deficient number, since it is larger than the sum of its proper divisors (36333785398).

71649381506 is a wasteful number, since it uses less digits than its factorization.

71649381506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176245.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 71649381506 in words is "seventy-one billion, six hundred forty-nine million, three hundred eighty-one thousand, five hundred six".