71129640202 has 4 divisors (see below), whose sum is σ = 106694460306. Its totient is φ = 35564820100.

The previous prime is 71129640157. The next prime is 71129640221. The reversal of 71129640202 is 20204692117.

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

It can be written as a sum of positive squares in only one way, i.e., 68210291241 + 2919348961 = 261171^2 + 54031^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17782410049 + ... + 17782410052.

Almost surely, 2^71129640202 is an apocalyptic number.

71129640202 is a deficient number, since it is larger than the sum of its proper divisors (35564820104).

71129640202 is a wasteful number, since it uses less digits than its factorization.

71129640202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35564820103.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 71129640202 in words is "seventy-one billion, one hundred twenty-nine million, six hundred forty thousand, two hundred two".