73681020202 has 4 divisors (see below), whose sum is σ = 110521530306. Its totient is φ = 36840510100.

The previous prime is 73681020199. The next prime is 73681020211. The reversal of 73681020202 is 20202018637.

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., 63816359161 + 9864661041 = 252619^2 + 99321^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18420255049 + ... + 18420255052.

Almost surely, 2^73681020202 is an apocalyptic number.

73681020202 is a deficient number, since it is larger than the sum of its proper divisors (36840510104).

73681020202 is a wasteful number, since it uses less digits than its factorization.

73681020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36840510103.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 73681020202 its reverse (20202018637), we get a palindrome (93883038839).

The spelling of 73681020202 in words is "seventy-three billion, six hundred eighty-one million, twenty thousand, two hundred two".