66604201031 has 4 divisors (see below), whose sum is σ = 66605404512. Its totient is φ = 66602997552.

The previous prime is 66604201019. The next prime is 66604201049. The reversal of 66604201031 is 13010240666.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66604201031 is a prime.

It is a super-2 number, since 2×66604201031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66604200985 and 66604201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604201061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514511 + ... + 630816.

It is an arithmetic number, because the mean of its divisors is an integer number (16651351128).

Almost surely, 2^66604201031 is an apocalyptic number.

66604201031 is a deficient number, since it is larger than the sum of its proper divisors (1203481).

66604201031 is a wasteful number, since it uses less digits than its factorization.

66604201031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203480.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 66604201031 its reverse (13010240666), we get a palindrome (79614441697).

The spelling of 66604201031 in words is "sixty-six billion, six hundred four million, two hundred one thousand, thirty-one".