71603639642 has 4 divisors (see below), whose sum is σ = 107405459466. Its totient is φ = 35801819820.

The previous prime is 71603639641. The next prime is 71603639669. The reversal of 71603639642 is 24693630617.

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., 68158067041 + 3445572601 = 261071^2 + 58699^2 .

It is not an unprimeable number, because it can be changed into a prime (71603639641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17900909909 + ... + 17900909912.

Almost surely, 2^71603639642 is an apocalyptic number.

71603639642 is a deficient number, since it is larger than the sum of its proper divisors (35801819824).

71603639642 is a wasteful number, since it uses less digits than its factorization.

71603639642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35801819823.

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 71603639642 in words is "seventy-one billion, six hundred three million, six hundred thirty-nine thousand, six hundred forty-two".