66245636031 has 16 divisors (see below), whose sum is σ = 91183749120. Its totient is φ = 42735857760.

The previous prime is 66245636011. The next prime is 66245636059. The reversal of 66245636031 is 13063654266.

It is a happy number.

It is not a de Polignac number, because 66245636031 - 2⁷ = 66245635903 is a prime.

It is a super-2 number, since 2×66245636031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66245636011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2031030 + ... + 2063388.

It is an arithmetic number, because the mean of its divisors is an integer number (5698984320).

Almost surely, 2^66245636031 is an apocalyptic number.

66245636031 is a deficient number, since it is larger than the sum of its proper divisors (24938113089).

66245636031 is a wasteful number, since it uses less digits than its factorization.

66245636031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54406.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 66245636031 in words is "sixty-six billion, two hundred forty-five million, six hundred thirty-six thousand, thirty-one".